A 38-year-old Los Angeles man, accused of setting four arson fires in Arcadia and of carjacking a woman trying to move her car away from one of the fires, is arrested. The first fire was in a rear corridor on the second floor of The Shops at Santa Anita mall, at 400 South Baldwin Avenue at 11:40 A.M. on Friday. The other three fires were in the vicinity of the 900 block of Arcadia Avenue.