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Pakistani police say a bomb has exploded on a bus carrying female university students, killing at least 11 people.
Investigators say about 20 people were wounded in the blast, which took place Saturday in the southwestern city of Quetta.
Authorities say all of the victims killed in the explosion and a subsequent fire were female students.
There was no initial claim of responsibility for the blast.
Quetta is the main city in Baluchistan province, a region plagued by insurgent unrest.
Earlier Saturday, police said militants destroyed a historic house in Baluchistan province.
Authorities say the attackers planted several bombs near the 19th century wooden residence associated with Pakistan's founder. One guard was killed in the attack.
The blast occurred in the mountain resort town of Ziarat, where Mohammad Ali Jinnah lived before his death in 1948, a year after he led Pakistan to independence.
Police said the attackers shot and killed a police guard in the pre-dawn attack.
Baluchistan is home to several Baluch nationalist groups that demand greater rights and a share of gas and mineral revenues.