This drone was seen flying over the 4/20 rally at Civic Center in Denver on the afternoon of Sunday, April 20, 2014. (Larry Ryckman, The Denver Post)

Drone seen above Denver 4/20 rally investigated

The Federal Aviation Administration is investigating reports of a drone aircraft that was seen flying over the 4/20 marijuana rally in Denver on Sunday.

FAA spokesman Allen Kenitzer said Tuesday that people need permission to fly aircraft over crowded areas.

According to KMGH-TV, drones are sometimes considered model aircraft, which only have to follow FAA guidelines. Those guidelines say hobby aircraft-flyers must keep their aircrafts below 400 feet above ground level and away from airports and air traffic.

Denver police say they found two unidentified men flying a drone over the rally in Denver’s Civic Center Park. They were asked to leave the top of the McNichols Civic Center Building because they didn’t have the proper permission.

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Information from: KMGH-TV

This story was first published on DenverPost.com