At least three police officers were killed and 20 others wounded in two separate militant attacks in Pakistan's northwestern Khyber Pakhtunkhwa province on Wednesday.

Axar.az informs, citing The Associated Press, that the first attack occurred in the district of Upper Dir in Khyber Pakhtunkhwa province, where militants ambushed a security convoy, killing three police officers and wounding 15 others, local police official Ibrahim Khan said.

He said security forces returned fire and the exchange was ongoing.

Khan did not immediately say whether any militants had been killed or wounded.

Hours later, a suicide bomber rammed an explosives-laden vehicle into a police station in the city of Bannu, also in Khyber Pakhtunkhwa, wounding at least five police officers, police said. The blast damaged part of the station, but no fatalities were immediately reported.

No group immediately claimed responsibility for either attack, but suspicion is likely to fall on the Pakistani Taliban, known as Tehrik-e-Taliban Pakistan, or TTP.