A floor collapse on Tuesday at a hospital construction site near Bangkok killed at least 11 workers, and injured another 18, dpa quoted police as saying. The accident occurred in Bang Pli, Samut Prakan province, 20 kilometres north of Bangkok, where the Ramathibodi Hospital was under construction, Bang Pli Police Lieutenant Appiwat Kaesorn said. 'The workers were taking their lunch break when one of the floors collapsed on them,' Appiwat said by phone.