(Reuters) Militants in a volatile region of western Pakistan bombed a bus carrying women students on Saturday and then seized part of the hospital where survivors were taken, in the first major security test for the new prime minister, Nawaz Sharif.

At least 22 people were killed in a day of violence that started with an apparent separatist attack that destroyed a summer retreat once used by the nation’s founder Muhammad Ali Jinnah in the hills of Baluchistan province.

A policeman lost his life in the attack on a popular symbol of Pakistan’s history, which was gutted by fire after several small bombs were detonated.

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