Unpossible!

Shots fired near Whitehouse, an AK-47 assault rifle was recovered at the scene.

That can't be.  The number of guns allowed into the District of Columbia post heller has been enough to keep track of on paper without a computer database.  The city is still mostly a gun free zone.  I'd think they'd have noticed if someone had an actual assault rifle, you know, a MACHINE GUN (select fire, intermediate cartridge, mag fed shoulder arm subject to NFA rules for 77 years), come through the process.  So this gun they found probably doesn't really exist.  DC might have loosened up some, but not that much, and they still won't let Russian military hardware inside.

Hmmmm... maybe it was a Gunwalker gun, and ATF imported it to the Nation's Capital...