ISTANBUL At least five school children were among the seven people killed in a blast that hit a police van in Pakistan on Friday. The incident, which also injured 17 others, took place in the Mastung district of the southwestern Balochistan province, police said. “So far, seven individuals have been martyred, including five school students, and 17 others have sustained injuries,” Kalat Division Commissioner Naeem Bazai told the local daily Dawn. An explosive, placed on a motorcycle, was