ISLAMABAD, Oct. 30 (Xinhua) -- Three troops were killed and six others were injured in an exchange of firing between security forces and terrorists in Pakistan's northwest Khyber Pakhtunkhwa province on Wednesday, official sources said.

The incident happened in the Bannu area of the province, where the security forces launched an intelligence-based operation, triggering the exchange of fire, the sources told Xinhua.

Several terrorists were also killed in the attack, the sources added.

The injured people, including five security personnel and a civilian, were shifted to a nearby hospital. ■