Brussels, Rabi'I 2, 1437, Dec 13, 2015, SPA -- An explosion in a residential building in the east Belgian city of Verviers on Sunday tore the facade of the house and injured at least 13 people. According to dpa, initial images from the scene showed exposed rooms and a mountain of rubble. The building, which shared walls with two neighboring ones, was at risk of collapse, Belgian news agency Belga reported. There were no official details about the possible cause of the explosion. Radio broadcaster RTL reported that a gas leak was the possible cause. Some of the injured had to be taken to hospital, RTL reported. --SPA 21:23 LOCAL TIME 18:23 GMT www.spa.gov.sa/w