US
Tribesmen defuse two other bombs planted in the same site.
The same school was targeted a month prior to the attack on Thursday.
People will be repatriated between July 2 and July 7.
Residents fear the incident may widen rift between Mehsud, Ahmadzai tribes.
Suspended campaigns in North, South Waziristan lead to increase in cases.
Earlier the Ahmadzai Wazir tribe had asked for security on the road.
Residents of Kata Khel allegedly attacked Nawab Shaheed police station on June 12.
FDMA says they cannot provide food because they belong to safe areas of South Waziristan.
The company has been receiving telephone threats from unidentified people.
Tribesmen say lack of checks and balances, appropriate policies obstruct change in the tribal belt.