The toll in the Kolkata warehouse collapse incident rose to 16 on Saturday with the death of an injured person in a hospital, while rescue teams from multiple agencies sifted through the debris on the fourth day since the incident to ensure no one is still trapped, officials said. Cameras have been placed beneath the rubble to check for trapped persons, while mobile phone tower data is being used to trace the location of individuals whose phones remain active under the debris. "Our first priority is to complete the search and rescue operation.