IRVINE, Calif., Sept. 2 (UPI) -- California fire officials said a golf course blaze requiring nearly 200 firefighters began as a spark from a golf club hitting a rock.

Firefighters said the 12-acre fire Saturday at Irvine's Shady Canyon Golf Course began when a golfer, who was not identified, clinked his club against a rock while taking a shot from the rough at about noon, OC Weekly reported Thursday.

Orange County Fire Authority Capt. Greg McKeown told the Orange County Register nearly 200 firefighters battled the flames for several hours and the blaze was completely contained by 7:30 p.m.

McKeown said two crews remained at the scene overnight to prevent spot fires.