PESHAWAR, Pakistan: A pair of attacks on police vehicles by suspected militants killed at least six police officers and a civilian in northwest Pakistan on Tuesday, authorities said.

The assailants ambushed a police vehicle and killed one officer in Kohat, a district in Khyber Pakhtunkhwa province. When police reinforcements arrived minutes later, they launched another attack and killed five more officers and a civilian, police official Kamran Khan said.

Separately on Tuesday, a suicide bomber detonated explosives at a police post in Bukkur, a district in eastern Punjab province, killing two officers and wounding four others, police official Shahzad Rafiq said.

He provided no further details and only said officers were still investigating.

No group immediately claimed responsibility for the attacks, which have increased across the country in recent months.