An explosion in the Balochistan province of Pakistan has killed four police officers.
Dawn News reports that 12 other people were injured in the attack in the Satellite Town area of Quetta.
The blast, which is believed to have involved a motorcycle bomb, took place shortly after a police van arrived to provide security to people offering prayers at a mosque.
It is the second major attack in Balochistan within the last three days, after a luxury hotel in Gwadar was targeted and five people killed.
The banned Tehreek-i-Taliban Pakistan claimed responsibility for the latest attack.