MARINE Police launched a search for a Chinese cargo ship and a crew member after an emergency caller reported armed Public Security Bureau officers had boarded the craft in Hong Kong waters. The caller said he jumped overboard and swam to Lamma Island as mainland officers boarded his vessel, Yeung Kong, from a speedboat. A search by a Government Flying Service helicopter and four Marine Police launches was unable to trace the cargo ship or the speedboat. Police on Lamma failed to locate the informant. A government spokesman said Security Branch officials were seeking confirmation of the suspected incursion when Chinese authorities told them the Chinese-registered vessel had been intercepted by mainland police. 'But they told us that the interception took place off Lingding Island in Chinese waters,' the spokesman said. 'The vessel was arrested for smuggling left-hand drive vehicles into China and detained in a Zhuhai port.' The spokesman said the Hong Kong Government could not file a complaint or demand a further explanation from Chinese authorities over the possible incursion. 'We have no information to confirm the incident happened in Hong Kong waters,' he said. The drama began about 11.30 am yesterday, when police received an emergency radio call from a man surnamed Lui claiming a speedboat carrying five armed men wearing Public Security Bureau uniforms had intercepted the Yeung Kong off Lamma's power station. Minutes later, another emergency call was made by a man saying he had jumped overboard and swum ashore to Lamma as Chinese police boarded. Vessels fitting the boats' description were seen outside Hong Kong waters, heading towards China as Marine Police launches arrived. But a Government Flying Service helicopter failed to confirm the boats' identities when it joined the search. The search was called off at around 4 pm. The hunt on Lamma was also in vain.