Washington DC 9 hours ago Report highlights risks of a compromised Potomac River In the event of a drinking water crisis, Washington, D.C.’s reserve supply would only last one day, according to a new report. News4’s Mark Segraves has the details. Local 2:18 ‘A great heart': Community remembers boxing gym owner 2 years after he was killed 4:25 Firefighters battle flames at elementary school in Silver Spring 15:58 Metro plans to use automatic mode for first time since 2009 crash: The News4 Rundown 2:21 Prince George's County blood drive to help sickle cell patients in need of transfusions 2:39 Police video shows husband of missing Virginia mother speak with officers