BOULDER - Boulder police in riot gear quelled a disturbance outside the Fox Theatre on Monday evening as a large crowded jostled for free concert tickets.
Police said one man was arrested and another was issued a summons on brawling and resisting arrest charges and then released.
Police said the trouble started about 6 p.m. when about 2,000 people lined up for a free show at 8 p.m. by the rapper Tyler, The Creator. The University Hill theater, however, only has a 600-person capacity.
Some people began pushing and shoving and bottles were thrown, police said.
A manager at Jimmy John's Gourmet Sandwiches, next to the theater, said someone punched him in the face as he tried to open a path through the crowded sidewalk so customers could get into the eatery.
The manager told 7NEWS he went back inside, locked the door and called police.
A total of 75-80 officers, some in riot gear, responded, including officers from the Boulder County Sheriff's Office and University of Colorado Police Department.
Police blocked off 13th Street where it meets College Avenue and Pennsylvania Avenue.
One young woman said she didn't know what caused the clash, but said she saw some people throwing bottles at police.
AIRTRACKER7 arrived over the area at 6:47 p.m. and found a mass of people packing the sidewalk outside the theater and several police vehicles with flashing lights, but no visible signs of trouble. A couple of ambulances, fire trucks and about six police vehicles were staged a few blocks away.
Things settled down after Tyler, The Creator, said he was adding a second free show at 10 p.m.
Some people said they'd been waiting about 90 minutes to get into the theater. Yet, the young crowd appeared in pretty good spirits.
One man said, "The police officers have been very kind."
"They came up to us and explained why the wait was so long," a woman chimed in. "We saw some pretty big guns, pretty intimidating," she added.
7NEWS reporter Russell Haythorn called the crowd "lively," but not "hostile."
Police said officers were staying outside the theater to maintain control.
Some photos on Twitter showed young people striking funny poses in front of police in riot gear.