Mourners laid flowers outside a collapsed supermarket in Latvia's capital Friday.<br/> <br />At least 51 people - including three fireman - were killed in the worst disaster the Baltic state has seen in decades.<br/> <br />Rescue workers used their hands and crowbars to move rubble and stopped periodically to listen for survivors or the sounds of their cell phones.<br/> <br />Cranes were also brought in to move large concrete slabs.<br/> <br />It's unclear how many people were trapped inside the grocery store when the roof caved in, but the store was busy with evening shoppers on their way home from work.<br/> <br />One husband said he had hope his wife was still alive.<br/> <br />(SOUNDBITE) (Russian) IGOR UMANOV, HUSBAND OF WOMAN STUCK INSIDE COLLAPSED STORE SAYING:<br/> <br />''I have a wife there. There is no information about her, whether she is dead or alive."<br/> <br />Several firefighters were injured when the weakened structure caved in a second time.<br/> <br />Local media said workers had been building a roof garden o
