QUETTA, Pakistan — A p owerful car bomb outside the headquarters of Pakistan’s paramilitary security forces killed at least 10 people on Tuesday and wounded 30 others, authorities said.

Before detonating their vehicle, as many as six militants inside the car stepped outside and engaged troops in an intense shootout, according to the police. All six attackers were reported to have been killed.

Residents said the blast in the southwestern city of Quetta could be heard from miles away. Ambulances rushed to the site in front of the Frontier Constabulary and rescuers transported the wounded to nearby hospitals.

No group immediately claimed responsibility, though suspicion is likely to fall on separatists who often target civilians and security forces in insurgency-plagued Balochistan , w

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