People who gathered for daily prayers in the Pakistan mosque on the fateful evening of Monday did not know that they were offering their last prayers. A bomb blast claimed four lives, including a child while they were praying in a Shi'ite Muslim mosque in Pakistan's north-western city of Dera Ismail Khan on Monday. Three other people were injured in the blast. The bomb went off at dusk when Shi'ites were gathered in the mosque for prayers.