At least three persons were wounded and ten others including six tribal peace force personnel were killed in different incidents of violence in Pakistan\'s tribal agencies on Tuesday, said officials. The first incident took place in Lower Kurram tribal agency. Security sources told KUNA that a bus carrying passengers, mostly Shi\'ite, was traveling from agency\'s main city Parachinar to Peshawar city when unknown suspects opened fire at it. Three passengers were seriously wounded in the incident, said sources. Also, said sources further, in Khyber tribal agency four militants were killed when an explosive device accidentally exploded in their hideout. The sources said that six bullet-riddled dead-bodies of Tribal Lashkar (force) personnel were found in Tirah valley of Khyber agency. They said the militants had kidnapped more than fifteen Lashkar personnel a week ago. The dead-bodies of seven were found on Friday and six were wounded today morning.