Police chief Liaquat Ali Khan says Saturday’s explosion occurred near the office’s perimeter wall at about 7 a.m. in Peshawar.

He says the building belonging to Shift International, a group helping handicapped people, was damaged.

Khan says it was a bomb set off with a timer but some TV reports say it was a rocket attack.

Peshawar has seen a wave of bombings over the last few weeks as the army presses an offensive against Taliban militants in an adjacent tribal region bordering Afghanistan.