QUETTA: At least two personnel of the Balochistan Constabulary were killed and several injured on Tuesday when unknown assailants opened fire on their vehicle in the province's Mastung area.

The Balochistan Constabulary vehicle was on a routine patrol in Splanji area of Mastung district when the militants attacked them from nearby mountains, a Levies man said.

"Several personnel were injured in the attack," he said. However, the number of attackers could not be determined as yet.

The vehicle was also badly damaged in the incident. Rescue teams rushed to the site of attack and shifted the injured to a hospital in Quetta.

Police, Levies and Frontier Corps personnel cordoned off the area as a probe into the incident went under way.

There was no immediate claim of responsibility for the attack until the filing of this report.

Militants have been targeting security forces and vital national installations in the district for more than a decade.

Mastung is considered to be one of the most sensitive and troubled districts of Balochistan.