Police: Shots fired at Colo. pot holiday gathering

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Members of a crowd numbering tens of thousands smoke marijuana and listen to live music, at the Denver 420 pro-marijuana rally at Civic Center Park in Denver on Saturday, April 20, 2013. Even before the passage in November 2012 of Colorado Amendment 64 promised the legalization of marijuana for recreational use, April 20th has for years been a celebration of marijuana counterculture, and the 2013 Denver rally draw larger crowds than previous years. (AP Photo/Brennan Linsley)

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

Witnesses say they heard three or more shots about 20 minutes after 4:20 p.m. Police swarmed the scene, and crime tape was around the pavilion where the celebration was being held.

Aerial footage showed the massive crowd frantically running from the park.

The pot celebration Saturday was the first since Colorado and Washington made marijuana legal for recreational use.

A sizable police force on motorcycles and horses watched the celebration. But officers didn't arrest people for smoking in public, which is still illegal.

A crowd estimate wasn't immediately available, but organizers predicted some 80,000 at the nation's largest 4/20 observation.