Authorities are currently searching for an older model black four-door BMW, a passenger of which fired a gun at a revelry motorcoach on the Baltimore-Washington Parkway on Sunday. Police believe that the two vehicles got into an altercation while driving on the Parkway near the New York Avenue ramp at 3:30 a.m., and when both vehicles pulled over to the median, a passenger leaned out of a window of the Beamer and fired a gun into the windshield of the bus, which was carrying about 50 people. No one was injured in the shooting.