Eleven people were killed and 44 injured in a powerful explosion outside a mosque in the north-western Yemeni province of Saada on Friday, police officials said, according to DPA. The officials told Deutsche Presse-Agentur dpa that a booby- trapped motorcycle blew up outside the Bin Salman mosque shortly after the weekly prayers in the provincial city of Saada. Witnesses said the bomb went off as worshippers were leaving the mosque. "Dozens of injured people were seen lying outside the mosque, and several cars were burned by the blast," a witness said in a telephone call from Saada, some 230 kilometres north of Sanaa.