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Pakistani fire fighters extinguish a burning university bus after a bomb blast in Quetta, the capital of Baluchistan province, on June 15, 2013. At least 23 people were killed after militants blew up a bus carrying female students in Pakistan's troubled southwest and later targeted the hospital treating survivors, as a gun battle with insurgents continued, officials said. AFP PHOTO/ Banaras KHAN/AFP/Getty Images ( 520598322 )

Pakistani pedestrians come out of a hospital during a paramilitary operation against militants at the hospital in Quetta, the capital of Baluchistan province, on June 15, 2013. AFP PHOTO/ Banaras KHAN/AFP/Getty Images ( 520598040 )

Pakistani security forces prepare to storm a hospital building during a gun battle in Quetta, Pakistan, Saturday, June 15, 2013. (AP Photo/Arshad Butt) ( Pakistan )

A Pakistani boy who was injured by gunmen is carried to a vehicle outside a hospital in Quetta, Pakistan, Saturday, June 15, 2013. Gunmen took over parts of a hospital in southwestern Pakistan Saturday after a bomb went off inside its emergency room, officials said. Several people died before authorities stormed the building and freed the hostages trapped inside. (AP Photo/Arshad Butt) ( Pakistan )

Pakistani security personnel remove a dead boy after a bomb blast in a university bus in Quetta, the capital of Baluchistan province, on June 15, 2013. AFP PHOTO/ Banaras KHAN/AFP/Getty Images ( 520597862 )

Pakistani fire fighters extinguish a burning university bus after the bomb blast in Quetta, the capital of Baluchistan province, on June 15, 2013. AFP PHOTO/ Banaras KHAN/AFP/Getty Images ( 520597649 )

Pakistani paramilitary soldiers carry their colleague who was wounded during a gun battle at a hospital, in Quetta, Pakistan, Saturday, June 15, 2013. (AP Photo/Arshad Butt) ( Pakistan )

Pakistani security forces take up positions outside a hospital during a gun battle in Quetta, Pakistan, Saturday, June 15, 2013. (AP Photo/Arshad Butt) ( Pakistan )

Pakistani fire fighters extinguish a burning university bus after the bomb blast in Quetta, the capital of Baluchistan province, on June 15, 2013. AFP PHOTO/ Banaras KHAN/AFP/Getty Images ( 520597621 )

Pakistani paramilitary soldiers take position after militants attacked a hospital in Quetta, the capital of Baluchistan province, on June 15, 2013. AFP PHOTO/ Banaras KHAN/AFP/Getty Images ( 520597725 )

Pakistani fire fighters extinguish a burning university bus after the bomb blast in Quetta, the capital of Baluchistan province, on June 15, 2013. AFP PHOTO/ Banaras KHAN/AFP/Getty Images ( 520597627 )

Pakistani women help a patient (2L) get away from a hospital during a paramilitary operation against militants at a hospital in Quetta, the capital of Baluchistan province, on June 15, 2013. AFP PHOTO/ Banaras KHAN/AFP/Getty Images ( 520598096 )

Pakistani paramilitary soldiers take position after militants attacked a hospital in Quetta, the capital of Baluchistan province, on June 15, 2013. AFP PHOTO/ Banaras KHAN/AFP/Getty Images ( 520597692 )

Pakistani security personnel inspect a burnt university bus after a bomb blast in Quetta, the capital of Baluchistan province, on June 15, 2013. AFP PHOTO/ Banaras KHAN/AFP/Getty Images ( 520597918 )

Pakistani paramilitary soldiers take position after militants attacked a hospital in Quetta, the capital of Baluchistan province, on June 15, 2013. AFP PHOTO/ Banaras KHAN/AFP/Getty Images ( 520597743 )

Pakistani paramilitary soldiers take position after militants attacked a hospital in Quetta, the capital of Baluchistan province, on June 15, 2013. AFP PHOTO/ Banaras KHAN/AFP/Getty Images ( 520598260 )

Pakistani police officers detain an alleged militant from the site of a gun battle at a hospital, in Quetta, Pakistan, Saturday, June 15, 2013. (AP Photo/Arshad Butt) ( Pakistan )