The Baltimore-Washington Parkway reopened to traffic after a seven-vehicle crash ended with a gunshot and a carjacking in the southbound lanes early Tuesday, police said.Media outlets report that U.S. Park Police spokeswoman Sgt. Anna Rose said police believe the crash may be related to a robbery at the Tastee Diner in Laurel early Tuesday.Laurel spokeswoman Joyce Jackson says three masked men robbed the Tastee Diner in Laurel early Tuesday and fled in a burgundy BMW.Rose says the car hit several vehicles and the driver fired a shot. She says no one was struck, but the man carjacked a vehicle and fled. The vehicle was found in Washington without the driver.Rose says several people were taken to hospitals with minor injuries. It's not clear whether the other suspects were involved in the crash.Shortly after 7 a.m., the U.S. Park Police said on Twitter that all lanes were open on Interstate 295.Earlier in the morning, the State Highway Administration said all lanes were closed to southbound traffic at MD 198. Motorists were urged to seek an alternate route as police responded to a crash.