A Hong Kong oil-barge skipper said he was injured in a scuffle with mainland marine police who boarded his vessel in waters off Hong Kong. Ng Yiu-lun, 26, said he was in SAR waters west of Sha Chau when four armed Zhuhai border police officers from a patrol vessel boarded his barge on Wednesday night. 'They came on to my barge and instructed me to go with them. I was beaten after I refused,' he said. Mr Ng accused SAR marine police of failing to help him even though he said he was in Hong Kong waters when the incident happened. 'The Hong Kong police just watched us from a distance and did nothing.' Mr Ng said he was working for a Hong Kong company selling fuel to fishing boats west of Lantau. During the raid, two barges made off while six others sailed to the mainland with Zhuhai police. Mr Ng sailed to Sha Chau and called police. He was treated at Tuen Mun Hospital. A spokeswoman said SAR police had no role to play in the incident as it had taken place outside Hong Kong waters. Zhuhai authorities could not be reached for comment.