Rescuers have been calling for silence at the scene of a collapsed supermarket in the Latvian capital Riga as they try to locate victims by calling their mobile phones.\n\nAt least 45 people have died and more are feared missing in the rubble after the building's roof fell in on Thursday.\n\nVictoria Sembele from Latvia's State Fire and Rescue Service said the exact number of people still to be recovered was unknown.\n\n\n\namerica