Shots fired at US pot holiday gathering in Denver: Police

DENVER (AP) - Denver police say shots have been fired at a marijuana celebration held to mark the counterculture holiday 4/20. They say one person has been hit in the leg and another is down with unknown injuries.

Witnesses say they heard three or more shots. Police swarmed the scene.

Aerial footage showed the massive crowd frantically running from the park. A crowd estimate wasn't immediately available, but organisers predicted some 80,000 at the nation's largest 4/20 observation.

The celebration on Saturday was the first since Colorado and Washington made marijuana legal for recreational use. A sizable police force watched the celebration, but officers didn't arrest people for smoking in public, which is still illegal.