However, Labour and Welfare secretary Matthew Cheung Kin-chung told local papers that 10 summonses had been issued to site owners for other site safety lapses. The sweep came after two workers were killed and five trapped in wreckage when a Wolffkran crane collapsed during a climbing operation at a demolition site in Causeway Bay. The wave of inspections will be backed up by a course on crane safety awareness at the Construction Industry Training Authority next monthj.