- Militants riding on motorcycles opened fire at a vehicle carrying paramilitary forces in southwestern Pakistan on Wednesday, killing four troops before fleeing, police said.
Police and personnel of other law enforcement agencies reached the spot as investigation into the incident went under way.
Pakistani police officers and paramilitary soldiers guard the site of a firing incident in Quetta, on Wednesday.
The banned Tehrik-e Taliban Pakistan (TTP) claimed responsibility for the attack.
The blast took place near a police truck parked close to GPO Chowk on Quetta's Zarghoon Road, located in the city's high-security Red Zone, around 300 metres from the provincial assembly building.
In January, two Balochistan Constabulary personnel were gunned down, while one injured by unidentified men on Quetta's Double Road, according to reports.
Pakistan is not complying with the UN Security Council resolutions on sanctions against terrorists, the U.S. has said amid reports that it is spearheading an effort along with India to get Islamabad included in an global terrorist-financing watchlist.