BEIJING, July 5 (Xinhua) — The headmaster and building contractor were arrested Saturday after a school building wall collapsed and killed four students in southwestern Guangxi Zhuang Autonomous Region in mid-June.

    Four students were killed and eight were injured on their way to the mess hall of the school at Liubao Town, Cangwu County, when the enclosing wall collapsed at about 5 p.m. June 16.

    Headmaster Wu Yuanming and building contractor Li Qinghua were arrested and to be prosecuted, local authorities said.