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.
Security official Rahmat Gul told RFE/RL that the vehicle of the official, identified as Fawad Khan, was struck by a bomb in Bajaur on September 17.
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.
Bajaur is one of the seven tribal agencies that makes up Pakistan's Federally Administered Tribal Areas along its volatile border with Afghanistan, where Army is battling Taliban.
"A government official and five security personnel were among the killed", said a political administration official of the agency, adding that the target of the miscreants was the security forces.
He said a four-country group including Pakistan, China, the USA and Afghanistan could be expanded to include other countries with influence over the Taliban.
Bajaur Agency has seen intense fighting between militants and security forces in the past.
Both Pakistan and Afghanistan accuse each other of providing safe havens to militant groups.
The militant violence has killed tens of thousands of Pakistanis over the years.