FREDERICK, Md. (AP) -- A fire department official says three people were killed and two others were injured when an airplane and a helicopter collided in midair at Frederick Municipal Airport in Maryland.

(Gord Horne, ThinkStock)

Capt. Kevin Fox of Frederick County Fire and Rescue says the collision occurred at 3:40 p.m.

He says it's not clear how the collision occurred or which victims were aboard which aircraft.

The injured victims were taken to a trauma center in Hagerstown. Fox did not know the extent of their injuries.

Aerial footage from WJZ-TV in Baltimore showed an airplane that had crashed into a stand of trees.

The airport opened in 1948. It has two runways.

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