PESHAWAR: Four security personnel were killed on Tuesday near Tank District's Sheikh Otar area bordering South Waziristan.

According to a security source, the security personnel were on duty at the Gomal Zam Dam road — which is under construction — when unknown motorcyclists opened fire at them. The source added that two Frontier Corps (FC) personnel and two workers from Frontier Works Organisation (FWO) were killed in the firing.

Earlier this month, a security personnel was killed and four others injured in terrorist attacks in South Waziristan and Bannu, respectively.

Know more: Security official killed, four injured in S Waziristan, Bannu attacks

The semi-autonomous tribal areas on the Afghan border have for years been a hideout for militants of all stripes, including Al Qaeda and the Pakistani Taliban as well as foreign fighters such as Uzbeks and Uighurs.

Pakistan began a long-awaited push to clear insurgent bases from North Waziristan last June after a bloody Taliban attack on Karachi airport finally sank faltering peace talks.