"Three gunmen fired at the customs team indiscriminately. Four officials died on the spot and another succumbed to his injuries in hospital later," Sohaib Ashraf, district police chief in Kohat, told AFP.
"We are unaware of the identity of the attackers but it's an act of terrorism," he said.
Another police official in the area, Iqbal Mohmand said the attackers escaped on foot under cover of darkness.
A customs department official also confirmed the incident.
"It was a terrorist attack on our team. All five members of the team were killed in this attack. They hailed from local areas of Kohat and Karak districts," he said.
Uniformed government officials, including polio vaccination workers, are often targeted by militants in the area.
Customs officials, meanwhile, sometimes come under attack by criminal gangs.
Pakistan has strengthened its anti-terror strategy in the wake of a December 16 attack on an army-run school in Peshawar that killed 153 people, 134 of them children.
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Speaks volume of an incompetent CM and Police. Imran Khan is still on honey moon. PTI is on slump. Thanks to their indifference to people of KPK.
Watch how PTI's apologist would now come out to deflect the blame from the political arm of TTP running the government in KPK by explaining that the terrorists entered into KPK from FATA passing through numerous check-posts manned by the Army, the armaments they used came across the border and this again is the headache of the federal government and the army. Finally, these perpetrators committed the crime and went back to FATA.