An Army National Guard helicopter carrying sheriff's deputies on an anti-drug surveillance mission near the U.S.-Mexican border crashed into a mountainside and burned, killing all eight people aboard, officials said Tuesday.

The UH-1H helicopter went down in the foothills of the Laguna Mountains while on patrol for Operation Border Ranger, described as a joint anti-drug smuggling operation conducted by Southern California sheriff's departments and the federal government.The victims included two members of the Los Angeles County Sheriff's Office and one each from Riverside, Orange and Imperial Counties, according to a statement issued this morning by the Imperial County Sheriff's office.