At least six persons were killed and another 16 injured in Mumbai after an old residential multi-storeyed building collapsed near J.J. Hospital on Thursday, an official said. According to BMC Disaster Control official, so far 14 persons have been rescued from the rubble within three hours of the incident and efforts are underway to save more lives. As per eyewitness accounts, at least two dozen more people were still feared buried. According to the Fire Brigade, the building's two wings have completely collapsed. The cause is under probe.