AP, India : Rescuers using backhoes and shovels searched for survivors Sunday under a massive pile of broken concrete and dust that was left when a residential building under construction collapsed in southern India, killing at least 15 workers. Authorities suspected dozens more may be trapped under the rubble, but were still trying to determine how many workers were on site when the five-story structure crumpled Saturday afternoon in the state of Goa. Witnesses reported seeing at least 40 workers. Soldiers and firefighters listened for movement or cries from the wreckage as they worked overnight to clear the debris, state official Venancio Furtado said. At least 10 people were pulled out alive overnight, but the chance of finding survivors was dwindling, Furtado said. By Sunday afternoon, the death toll had reached 15, according to the state government.