A powerful explosion ripped through the office of the Aman committee in the central market of Darra Adam Khel.
Police officials said they believed that the office had been hit by a suicide bomber.
The wounded were rushed to a nearby hospital. No other details were immediately available.
No group has claimed responsibility.
The banned Pakistani Taliban had a strong presence in the Darra Adam Khel region till the army launched an operation to flush them out of the area in 2009.