Details are emerging as local police as well as federal agencies and SWAT teams swarm the south east end of the city looking for an \"active shooter\" near a naval base in Washington, D.C. Three people have been shot but it is unclear if they are still alive. One of the victims is a police officer shot in both legs. The area in question is largely residential but also houses a metro train station. Schools have been shut down for the time being. Local media reports indicate shots are still being heard