Quetta, September 8 (NDTV.COM) A powerful bomb exploded near a bus station in southwestern Pakistan on Friday, killing at least four people and wounding 13 others, police said.

The attack happened in Barkhan, a town about 300 kilometers north of Quetta, said Hafiz Inayat Ullah, an area police chief.

The dead and injured have been shifted to the hospital, where some of the injured are listed in a critical condition, he said.