Remembering that this report is from local lamestream media, we need to take these descriptions with a grain of salt.
For all we really know (because what do reporters in DC know about firearms?), the firearm could have been an M1911 or an SP101 as easily as it was an "AK47 type weapon."
And the vehicle may also have been a red SUV. Think back to the DC sniper case... white van. It turned out to be a blue Chevy Caprice.