ANTIOCH -- A 31-year-old woman died, and two men were hospitalized early Sunday morning after a night of roller skating by a group of adults at the Contra Costa County Fairgrounds was marred by gunfire, a Contra Costa Sheriff's Office spokesman said.

The shooting occurred outside the Paradise Skate Roller Rink on the Fairgrounds, which is located at 1201 W. 10th Street. The Fairgrounds was hosting an Adult Late Night Skate Jam on Saturday night, Fairgrounds CEO Robert Williamson said in a statement. The occasion drew more than 100 people to the Fairgrounds, Sheriff's Office Lt. Darren Hobbs said.

Hobbs and Williamson each said a group of people fought outside the skate rink. It wasn't known immediately how many people were involved, but at somepoint, somebody pulled out a gun and somebody else called 911, Hobbs said.

As deputies were responding, Antioch police reported that at least one person was shot, Sheriff's Office spokesman Jimmy Lee said. Deputies arrived to find the woman with at least one gunshot wound, Hobbs said.

She was taken to Sutter Delta Medical Center in Antioch where she was pronounced dead, Lee said. Her identity has not been released, pending notification of her relatives, Lee said.

The two other victims did not receive life-threatening injuries, authorities said. One was an 18-year-old man and the other a man estimated to be in his 40s, Hobbs said. They were taken by ambulance to John Muir Medical Center in Walnut Creek, he said.

"Our thoughts and prayers are with the victims and their families," Williamson said. "We are deeply saddened by the entire incident. We strive to create a family-friendly atmosphere and take every precaution to keep individuals safe, and my heart breaks to learn of such violence."

The adults at the skate night are part of a skating club called "As The Wheel Turns" that has gathered at the Fairgrounds monthly since February, Williamson said. He said the future of the event is up in the air.

"That's something we have to sit down and discuss with our staff," he said. "Up to this point, it's always been a safe event. And everything that happened went down outside the rink in the parking lot. But we will have to discuss where we go from here."

Deputies do not have any suspects in the shooting, and no arrests have been made, Hobbs said.

Check back for updates.

Contact Rick Hurd at 925-945-4789 and follow him at Twitter.com/3rdERH.