A gunfire in Washington 13 dead persons, 2 suspects search

The buildings of the American Navy had been shoot by one or more peoples, the building is composed of navy offices, in the south east of the capital, this shoots make 13 dead persons and some wounded persons. As part of the victims, the police officer of the Columbia district and a policeman, but too the person who have shoot the peoples : Aaron Alexis, killed by the police.
The federal police did an public call, to get information about "his recent movement, his contact and his acquaintance.
The reason of his old reservist who had worked at the Navy of Washington from 2007 to 2011 stay unknown. "it's probably a terrorist act" had say the Washington mayor Vincent Gray.