The kidnapped officials whose names and designations were not revealed were freed while they were being taken to the seminary of Taliban commander Maulana Jalaluddin Haqqani near the cattle market in North Waziristan, local daily Dawn said in a report on Tuesday.
No details were given about the motive of the kidnappings.
An injured kidnapper told police during interrogation that their local Taliban chief, Amir Ahmed Gul, had informed them that they were going to attack a foreigners' camp in Thall.
He said they did not know that the chief would use them for kidnapping PAEC officials.
However, the newspaper quoted police officials as saying that that the kidnappers were posing themselves as Taliban to misguide the police.
On Monday, Pakistan Foreign Office Spokesperson Tasnim Aslam during a media briefing declined to answer a question relating to the kidnapping saying that she had no information on it.
One of the tribes who took part in Sunday's kidnapping said they were taking the abducted people and the vehicles to the seminary of Haqqani when police intercepted them.