In this image taken from video and provided by WABC-TV in New York, investigators stand near a remote controlled toy helicopter that apparently struck and killed a 19-year-old man Thursday, Sept. 5, 2013, at Calvert Vaux Park in the Brooklyn borough of New York. (AP Photo/WABC-TV)

NEW YORK - A remote control helicopter being flown in a New York City park has struck a teenager in the head and killed him.

Police say the accident occurred Thursday afternoon near a parkway in the Gravesend section of Brooklyn but it's unclear what happened.

Police haven't said if the 19-year-old was struck by a remote control helicopter he was operating or by someone else's. They say he suffered a severe head injury but they don't believe any criminal act was involved.

Enthusiasts are allowed to operate model aircraft in designated parts of Calvert Vaux Park, which features a playground, basketball courts, baseball diamonds and a soccer field.

A group called Seaview Rotary Wings organizes flights in the park. Club members haven't responded to requests for comment.