Chinese workers killed in bus explosion in northern Pakistan

At least 10 people have died after a bus carrying Chinese engineers in northern Pakistan fell into a ditch following a "fiery explosion," according to local police.

Arif Khan, deputy commissioner of police for the Upper Kohistan region of Khyber Pakhtunkhwa province, told CNN that of the 10 dead, six were Chinese citizens. The remaining 31 injured were all Chinese citizens, he added. It is unclear whether the blast was caused by an improvised explosive device (IED) or engine failure, Khan said.