QUETTA, Pakistan (AP) — Gunmen opened fire on a police officer's car in the Pakistani city of Quetta early Wednesday, killing his young son and uncle, and critically wounding the officer, police said.

Officer Abdul Qayum says fellow officer Abdul Samad came under attack while returning home after purchasing food for breakfast.

Qayum said the attackers escaped on motorcycles.

The Pakistani Taliban claimed the attack and vowed to continue targeting security forces that it says are subservient to the United States.

The attack came hours after counter-terrorism police killed four suspected militants in an overnight raid in Quetta. The city's police chief, Abur Razzaq Cheema, said six officers were wounded in an hours-long firefight.

Quetta is the capital of Baluchistan province, which is the scene of a low-level insurgency by Baluch separatists. Islamic militants also operate in the region.

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Associated Press reporter Ishtiaq Mahsud in Dera Ismail Khan, Pakistan, contributed to this report.

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