Police arrested Norman Polk at Anacostia Metro station.

The teen and his accomplice have been charged with assault with intent to kill.

A Metrobus driver and two other people were shot just before 1 p.m. today in the bus bay area outside the Anacostia Metro station. One of the shooting victims is described as being in critical condition — NBC4 says he appeared to be about 18 years old and suffered a gunshot wound to the chest. The Metrobus driver sustained a non-life threatening injury due to a bullet grazing his head. The third victim also suffered…