LANDI KOTAL, July 13: Unidentified militants blew up a bridge in Bara tehsil of Khyber tribal region on the night between Tuesday and Wednesday, officials said.

They said that militants planted huge quantity of explosives at a link bridge in Sheen Dand area of Bara. The explosives went off at midnight and destroyed the bridge, they added.

In another incident, a mentally retarded person killed at least three persons, including a woman, and injured four others in Tirah valley of the tribal region on Wednesday.

Sources said that a mentally retarded person entered a house in Tirah and opened indiscriminate firing on the inmates. Three persons were killed and four other received injuries in the incident, they said.

The residents of the area rushed to the scene and overpowered the mentally retarded attacker soon after the incident, they added.