Killed in the crash were pilot Stephen Bunker, 59; emergency medical technician Tanya Mallard, 39; flight paramedic Mickey Lippy, 34; and 18-year-old Ashley Younger. (pictured left to right)

DISTRICT HEIGHTS, Md. (AP) — State police are seeking witnesses to the flight or crash of a Medevac helicopter early Sunday.

Troopers ask that anyone who saw any part of the flight of Trooper 2 contact them. The helicopter traveled from the scene of a car crash in Waldorf until it crashed in Walker Mill Regional Park near Forestville. Four people were killed in the crash.

Witnesses should call 1-800-492-TIPS. The toll-free number is staffed 24 hours a day.

Authorities are also canvassing the neighborhoods around the crash site.