Islamabad, Pakistan (CNN) Militants wearing security force uniforms stopped two buses in southwest Pakistan on Thursday and killed 14 passengers after ordering them out of the vehicles, police said.

Balochistan provincial police chief Mohsin Ali Butt told CNN that 15 to 20 attackers stopped the buses near the town of Ormara, in the south of the province.

The militants ordered 14 out of the total passengers to disembark and shot them at close range before escaping. "This was an act of targeted killing," he said.

An alliance of Baloch separatists, Baloch Raaji Aajoi Sangar (BRAS), claimed responsibility for the killings, saying in a statement sent to journalists that they had targeted passengers who were part of the country's military.

In the statement a BRAS spokesman said: "Those who were killed carried identity cards of the Pakistan Navy and Coast Guard, and were killed after being identified."

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