(AP) — The four passengers killed in a tour bus crash near the California and Arizona border were two men and two women from Southern California, authorities said Thursday. The California Highway Patrol said the driver of the pipe-hauling truck was trying to pass slower vehicles in a 70-mph zone when he drifted onto the dirt shoulder and lost control. According to federal safety records, VG Transport has not been involved in any crashes reported to state officials over the past two years. "No one has made any allegations about the bus's maintenance or the bus driver's actions being contributing factors of this accident," company President Jerry Rosenbaum said in a statement.