Caption :CHAIN REACTION: Authorities helped people injured in a multi-vehicle crash in heavy fog on Interstate 15 near Oak Hills, Calif., Wednesday.Up to 30 vehicles were involved in a pileup.

• 描述：连环车祸：周三，加州橡树丘附近的15号州际公路发生连环车祸，大约30辆车撞在了一起，事故现场长达半英里，至少15人在事故中受伤。