Passers-by catch mugger after he poses as plain-clothes officer A 29-year-old mugger, who posed as a plain-clothes police officer and stopped and assaulted a male pedestrian, snatching his mobile phone in Mong Kok, was intercepted by two passers-by yesterday. The victim, 26, gave chase and shouted for help after the robbery at the junction of Nathan Road and Soy Street at about 2.30am. His shouts alerted two passers-by who stopped the thief in a subway in Soy Street. Policemen and suspect treated in hospital after drug arrest Two policemen received minor injuries while trying to subdue a suspected drug seller in Tuen Mun. Acting on information, officers intercepted the man, 24, as he got out of a car in Leung Choi Lane at about 12.15am. He scuffled with police but was eventually arrested. They seized a drug, believed to be ketamine with a street value of HK$5,000, in his car. The officers and suspect were treated at Tuen Mun Hospital. Collision at sea investigated The Marine Department is investigating a collision between a local fishing boat and a mainland cargo vessel off Lamma Island in which a woman, 34, on board the fishing boat, received head injuries. She was treated at Ruttonjee Hospital. The collision happened off Lamma Island at about 8.15am. The bow of the 13.8-metre fishing boat was dented. Three held over knife attack An employee at a cafe attacked two men with a 45cm-long knife after being assaulted in a dispute over money in the cafe in the shopping centre at Shun Lee Estate, Sau Mau Ping, at about 3.15pm. The three men, aged from 31 to 53, who were arrested by police, were treated at United Christian Hospital. Inmate expels swallowed tablets A remand inmate was found to have swallowed illegal drugs wrapped in plastic after arriving at Lai Chi Kok Reception Centre yesterday. The man, 47, was detained in an isolation cell on Tuesday on suspicion of having swallowed drugs to smuggle them into the centre. Officers found 11 tablets after the man went to the toilet.