At least 50 persons were killed when a suicide bomber struck a mosque packed with worshippers for Friday prayers in Pakistan's restive north-west Khyber tribal region today and the two-storey shrine also collapsed in the blast.

In one of the worst terror strikes in the country, the mosque situated in Jamrud area of Khyber tribal agency was targeted leaving at least 100 persons injured. About 300 persons were reported to be inside the mosque at the time of the attack.