Orange County Register -- November 15, 2009
As part of a training exercise for SWAT personnel, about 70 students, including volunteers from El Dorado and Yorba Linda high schools, joined police officers from the North County SWAT Team at Yorba Linda High School Sunday.
Police posted signs in the immediate area notifying the public of the training exercise. They advised nearby residents they would be firing blanks from their weapons, which simulated the sounds of gunfire and noise-flash devices.