Five security personnel were killed after a remote-controlled bomb went off at a roadside at Pakistan's northwestern tribal region sharing borders with Afghanistan on Sunday.
Officials said the administrator of the Mamoond sub-district, Fawad Ali, was being driven to a border village to attend a traditional assembly of tribal elders when his vehicle struck an improvised explosive device.
The Tehreek-e-Taliban (TTP) claimed responsibility for the explosion, saying it wanted "to eliminate the black infidel democratic system in Pakistan" and impose Islamic justice system.
Back in June 2014, the army launched a full-scale offensive in mountainous North Waziristan, part of which constitutes FATA, aimed at wiping out militant bases in the highly volatile tribal region.
However, a recent huddle of Pakistani diplomats in key world capitals had called for more careful approach towards ties with the USA and avoiding any confrontation with the country.
Since 2001, thousands of Pakistanis have lost their lives in bombings and other militant attacks, and many more have been displaced.
But militant groups are still able to carry out bloody attacks, particularly in the northwest.
It was against this backdrop that acting United States Special Representative for Afghanistan and Pakistan Alice Wells' scheduled trip to Pakistan was postponed last month at the request of the government of Pakistan.