National Guard troops from D.C., Maryland and Virginia will remain in D.C. after a mob stormed the U.S. Capitol on Wednesday.
The D.C. National Guard will be placed on a 30-day mobilization, ensuring that troops will be on the ground through Inauguration Day and beyond, two defense officials told NBC News.
The Maryland National Guard will remain in D.C. through the end of January, Gov. Larry Hogan announced at a news conference Thursday afternoon, decrying the "heinous and violent assault."
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About 2,000 personnel from Virginia's National Guard will stay in the District at least through Jan. 20, Gov. Ralph Northam announced Thursday afternoon, and Virginia State Police also will remain. He said the decision to extend the National Guard's deployment was based on conversations with Virginia's emergency teams and D.C. officials.
"We will be there until President-elect Biden is officially sworn in," Northam said on Twitter.
U.S. Army Secretary Ryan McCarthy said Thursday that 6,200 Guard members will be in D.C. by the weekend, from states including Maryland, Virginia, New Jersey and New York.
Hogan said Rep. Steny Hoyer called him Wednesday, pleaded for help and said he was sheltering with Senate leader Chuck Schumer and House leader Nancy Pelosi.
Hogan said he authorized the Maryland National Guard to respond on Wednesday but was “repeatedly denied approval to do so” by the U.S. Secretary of Defense's office. The troopers were approved to enter D.C. after about 90 minutes and were the first from out of state to respond, the governor said.
The D.C. troops will remain unarmed and will wear riot gear.
About 200 of the troops were on D.C. streets on Thursday, a day after angry supporters of President Donald Trump stormed the U.S. Capitol in a chaotic protest aimed at thwarting a peaceful transfer of power. Four deaths were reported on or around the U.S. Capitol grounds.
Andrew Harnik/AP
Capitol police stand with guns drawn near a barricaded door as protesters try to break into the House Chamber at the Capitol, Jan. 6, 2021, in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
Supporters of US President Donald Trump enter the US Capitol’s Rotunda on Jan. 6, 2021, in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
Supporters of US President Donald Trump enter the US Capitol’s Rotunda on Jan. 6, 2021, in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
Supporters of US President Donald Trump enter the US Capitol’s Rotunda on Jan. 6, 2021, in Washington, DC.
Kevin Dietsch/UPI/Bloomberg via Getty Images
U.S. Capitol police officers take positions as demonstrators enter the U.S. Capitol during a protest in Washington, DC, on Wednesday, Jan. 6, 2021.
(Photo by Win McNamee/Getty Images)
A protester is seen hanging from the balcony in the Senate Chamber on Jan. 6, 2021 in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
Supporters of US President Donald Trump enter the US Capitol’s Rotunda as reported tear gas smoke fills a corridor on Jan. 6, 2021, in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
US Capitol police officers try to stop supporters of US President Donald Trump to enter the Capitol on Jan. 6, 2021, in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
Supporters of US President Donald Trump enter the US Capitol on Jan. 6, 2021, in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
Supporters of US President Donald Trump roam under the Capitol Rotunda after invading the Capitol building on Jan. 6, 2021, in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
US Capitol police officers try to stop supporters of US President Donald Trump to enter the Capitol on Jan. 6, 2021, in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
Supporters of US President Donald Trump enter the US Capitol on Jan. 6, 2021, in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
Supporters of US President Donald Trump confront Capitol police officers enter the US Capitol on Jan. 6, 2021, in Washington, DC.
Photo by SAUL LOEB/AFP via Getty Images
Supporters of US President Donald Trump roam under the Capitol Rotunda after invading the Capitol building on January 6, 2021, in Washington, DC. – Demonstrators breeched security and entered the Capitol as Congress debated the a 2020 presidential election Electoral Vote Certification. (Photo by Saul LOEB / AFP) (Photo by SAUL LOEB/AFP via Getty Images)
(Photo by OLIVIER DOULIERY/AFP via Getty Images)
Police hold back supporters of US President Donald Trump as they gather outside the US Capitol’s Rotunda on Jan. 6, 2021, in Washington, DC.
Win McNamee/Getty Images
Protesters gather inside the U.S. Capitol Building on Jan. 6, 2021, in Washington, DC.
(Photo by Win McNamee/Getty Images)
A protester is seen inside the US Capitol Building on Jan. 6, 2021, in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
A supporter of US President Donald Trump sits at a desk after invading the Capitol Building on Jan. 6, 2021, in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
Supporters of US President Donald Trump protest in the US Capitol’s Rotunda on Jan. 6, 2021, in Washington, DC.
(Photo by SAUL LOEB/AFP via Getty Images)
Supporters of US President Donald Trump protest in the US Capitol’s Rotunda on Jan. 6, 2021, in Washington, DC.
Andrew Harnik/AP
Capitol police try to hold back protesters outside the east doors to the House side of the Capitol in Washington, DC, Jan. 6, 2021.
J. Scott Applewhite/AP
House of Representatives members leave the floor of the House chamber as protesters try to break into the chamber at the U.S. Capitol on Wednesday, Jan. 6, 2021, in Washington, DC.
Andrew Harnik/AP
People shelter in the House gallery as protesters try to break into the House Chamber at the Capitol, Jan. 6, 2021, in Washington, DC.
WASHINGTON, DC – JANUARY 06: Protesters interact with Capitol Police inside the U.S. Capitol Building on January 06, 2021 in Washington, DC. Congress held a joint session today to ratify President-elect Joe Biden’s 306-232 Electoral College win over President Donald Trump. A group of Republican senators said they would reject the Electoral College votes of several states unless Congress appointed a commission to audit the election results. (Photo by Win McNamee/Getty Images)
TOPSHOT – Damage is seen inside the US Capitol building early on January 7, 2021 in Washington, DC, after supporters of US President Donald Trump breeched security and entered the building during a session of Congress. – Donald Trump’s supporters stormed a session of Congress held today, January 6, to certify Joe Biden’s election win, triggering unprecedented chaos and violence at the heart of American democracy and accusations the president was attempting a coup. (Photo by Olivier DOULIERY / AFP) (Photo by OLIVIER DOULIERY/AFP via Getty Images)
(Photo by Jon Cherry/Getty Images)
WASHINGTON, DC – JANUARY 06: Two members of a pro-Trump mob look out through a broken window from inside the Capitol Building after breaking into it on January 6, 2021 in Washington, DC. A pro-Trump mob stormed the Capitol, breaking windows and clashing with police officers. Trump supporters gathered in the nation’s capital today to protest the ratification of President-elect Joe Biden’s Electoral College victory over President Trump in the 2020 election. (Photo by Jon Cherry/Getty Images)
(Photo by Jon Cherry/Getty Images)
WASHINGTON, DC – JANUARY 06: A member of a pro-Trump mob screams out at the crowd from the inside of the Capitol Building after breaking into it on January 6, 2021 in Washington, DC. A pro-Trump mob stormed the Capitol, breaking windows and clashing with police officers. Trump supporters gathered in the nation’s capital today to protest the ratification of President-elect Joe Biden’s Electoral College victory over President Trump in the 2020 election. (Photo by Jon Cherry/Getty Images)
(Photo by Jon Cherry/Getty Images)
WASHINGTON, DC – JANUARY 06: A member of a pro-Trump mob shatters a window with his fist from inside the Capitol Building after breaking into it on January 6, 2021 in Washington, DC. A pro-Trump mob stormed the Capitol, breaking windows and clashing with police officers. Trump supporters gathered in the nation’s capital today to protest the ratification of President-elect Joe Biden’s Electoral College victory over President Trump in the 2020 election. (Photo by Jon Cherry/Getty Images)
AP Photo/Manuel Balce Ceneta
Supporters of President Donald Trump are confronted by Capitol Police officers outside the Senate Chamber inside the Capitol, Wednesday, Jan. 6, 2021 in Washington. (AP Photo/Manuel Balce Ceneta)
(Photo by SAUL LOEB/AFP via Getty Images)
Supporters of US President Donald Trump sit inside the office of US Speaker of the House Nancy Pelosi as he protest inside the US Capitol in Washington, DC, January 6, 2021. – Demonstrators breeched security and entered the Capitol as Congress debated the a 2020 presidential election Electoral Vote Certification. (Photo by SAUL LOEB / AFP)
(Photo by SAUL LOEB/AFP via Getty Images)
A supporter of US President Donald Trump sits inside the office of US Speaker of the House Nancy Pelosi as he protest inside the US Capitol in Washington, DC, January 6, 2021. – Demonstrators breeched security and entered the Capitol as Congress debated the a 2020 presidential election Electoral Vote Certification. (Photo by SAUL LOEB / AFP)
(Photo by SAUL LOEB/AFP via Getty Images)
A supporter of US President Donald Trump sits inside the office of Speaker of the House Nancy Pelosi as he protest inside the US Capitol in Washington, DC, January 6, 2021. – Demonstrators breeched security and entered the Capitol as Congress debated the a 2020 presidential election Electoral Vote Certification. (Photo by SAUL LOEB / AFP)
(Photo by ROBERTO SCHMIDT/AFP via Getty Images)
Trump supporters clash with police and security forces as they gather inside the US Capitol in Washington, DC on January 6, 2021. – Demonstrators breeched security and entered the Capitol as Congress debated the a 2020 presidential election Electoral Vote Certification. (Photo by ROBERTO SCHMIDT / AFP)
(Photo by ROBERTO SCHMIDT/AFP via Getty Images)
Trump supporters clash with police and security forces as they gather inside the US Capitol in Washington, DC on January 6, 2021. – Demonstrators breeched security and entered the Capitol as Congress debated the a 2020 presidential election Electoral Vote Certification. (Photo by ROBERTO SCHMIDT / AFP)
(Photo by ROBERTO SCHMIDT/AFP via Getty Images)
Trump supporters clash with police and security forces as they gather inside the US Capitol in Washington, DC on January 6, 2021. – Demonstrators breeched security and entered the Capitol as Congress debated the a 2020 presidential election Electoral Vote Certification. (Photo by ROBERTO SCHMIDT / AFP)
(Photo by ROBERTO SCHMIDT/AFP via Getty Images)
Supporters of US President Donald Trump protest inside the US Capitol on January 6, 2021, in Washington, DC. – Demonstrators breeched security and entered the Capitol as Congress debated the a 2020 presidential election Electoral Vote Certification. (Photo by ROBERTO SCHMIDT / AFP)
Roberto Schmidt/AFP via Getty Images
Supporters of US President Donald Trump protest inside the US Capitol on Jan. 6, 2021, in Washington, DC. – Demonstrators breeched security and entered the Capitol as Congress debated the a 2020 presidential election Electoral Vote Certification. (Photo by ROBERTO SCHMIDT / AFP)
(Photo By Caroline Brehman/CQ-Roll Call, Inc via Getty Images)
UNITED STATES – JANUARY 6: A U.S. Capitol Police officer maces a Trump rioter who broke through a window on the first floor of the Capitol on Wednesday, Jan. 6, 2021. (Photo By Caroline Brehman/CQ-Roll Call, Inc via Getty Images)
(Photo by OLIVIER DOULIERY/AFP via Getty Images)
A Congress staffer holds his hands up while Capitol Police Swat team check everyone in the room as they secure the floor of Trump suporters in Washington, CD on January 6, 2021. – Donald Trump’s supporters stormed a session of Congress held today, January 6, to certify Joe Biden’s election win, triggering unprecedented chaos and violence at the heart of American democracy and accusations the president was attempting a coup. (Photo by Olivier DOULIERY / AFP)
(Photo By Caroline Brehman/CQ-Roll Call, Inc via Getty Images)
UNITED STATES – JANUARY 6: A U.S. Capitol Police officer is treated for injuries on the first floor of the Capitol on Wednesday, Jan. 6, 2021. (Photo By Caroline Brehman/CQ-Roll Call, Inc via Getty Images)
(Photo by OLIVIER DOULIERY/AFP via Getty Images)
A Capitol Police Swat team member patrols the US Capitol in Washington, CD on January 6, 2021. – Donald Trump’s supporters stormed a session of Congress held today, January 6, to certify Joe Biden’s election win, triggering unprecedented chaos and violence at the heart of American democracy and accusations the president was attempting a coup. (Photo by Olivier DOULIERY / AFP)
Photographer: Ting Shen/Bloomberg via Getty Images
A members of the U.S. Capitol Police responds to demonstrators at the U.S. Capitol in Washington, D.C., U.S. on Wednesday, Jan. 6, 2021. The U.S. Capitol was placed under lockdown and Vice President Mike Pence left the floor of Congress as hundreds of protesters swarmed past barricades surrounding the building where lawmakers were debating Joe Biden’s victory in the Electoral College. Photographer: Ting Shen/Bloomberg via Getty Images
Photographer: Ting Shen/Bloomberg via Getty Images
Members of the U.S. Capitol Police respond to the demonstrators at the U.S. Capitol in Washington, D.C., U.S. on Wednesday, Jan. 6, 2021. The U.S. Capitol was placed under lockdown and Vice President Mike Pence left the floor of Congress as hundreds of protesters swarmed past barricades surrounding the building where lawmakers were debating Joe Biden’s victory in the Electoral College. Photographer: Ting Shen/Bloomberg via Getty Images
D.C. troops will be at traffic control checkpoints and will support U.S. Capitol police, including by helping them reinforce the perimeter around the Capitol Building.
Law enforcement that responded to the Capitol on Wednesday included the D.C. National Guard, Maryland National Guard, Virginia National Guard and officers from multiple D.C.-area police departments. New York Gov. Andrew Cuomo said he would send 1,000 Guard troops to assist with security.
Stay with NBC Washington for more details on this developing story.