A northeast Kansas park is closed while police investigate the explosion death of a man who was helping clean up after a community fireworks show.

KCTV reports the 44-year-old Lansing man was a volunteer at Wednesday night’s Fourth of July fireworks display at Kenneth W. Bernard Community Park.

Lansing police said he and others were disposing of fireworks that had not discharged when 1 of the devices exploded near him.

A crowd of about 3,500 people who attended the show had already left the park when the man was killed.

The death is being investigated as an accident. The man’s name has not been released.