San Bruno Students Sickened by Tear Gas from Nearby County Jail

The San Francisco Sheriff's Department has apologized to students and staff at Portola Elementary School, who were sickened by wafting tear gas and pepper spray during a training exercise at the San Bruno jail. 

Officials released the chemicals Tuesday at 12:45 as part of an indoor crowd control training session. Somehow, the chemicals traveled one mile away to the school. 

Twenty students, along with some members of staff, began experiencing symptoms such as burning in the eyes, nose, and throat. 

All training involving the use of chemical agents has been paused while jail officials try to determine what happened. The sheriff's department says it has been conducting similar training exercises for 20 years without any prior incidents.