A bomb explosion on a bus in southwest Pakistan has killed at least 12 people and injured 19 others.
The bus, which was carrying 50 passengers, was travelling through the Bolan Pass region on a regular run from the provincial capital Quetta to the eastern border city of Lahore in neighbouring Punjab province when the explosion occurred.
Interior Minister Aftab Ahmed Khan Sherpao said the bomb could have been stored in a bag and placed under a seat on the bus.
No one has claimed responsibility for the attack.
