POLICE officers beat up a teenager and threatened to 'blow his head off' after he shot dead one of their colleagues, the High Court heard yesterday. Lau Ka-ming, 19, said he shot Constable Hon Wing-san, 19, in a moment of terror and confusion. Immediately after the shooting, Lau was arrested and dragged into a police van. There he was said to have been forced on to his knees by Constable Wong Yu-hoi, the dead man's partner, who pulled out his gun and said: 'Now run. I allow you to run.' The officer continued: 'If you run I'll fire at you to burst your head,' Lau said, adding that he was then punched in the back. Lau said that when he arrived at the police station he was taken to a room and ordered to lie face down on the floor. 'Then I heard lots of voices and somebody said, 'So this is the one who shot our colleague to death'.' He said he was suddenly attacked by a number of people, who kicked and punched him. When they left, he stayed on the floor until a sergeant arrived and told him to sign a statement, the court heard. He said he did so without reading it. Lau was taken to another room where acting Superintendent Glynn Davies entered the room with a group of other officers, the jury heard. '[Superintendent Davies] then gripped me near my mouth and spoke to me in Cantonese, saying, 'Now it is a police officer hitting you, not you hitting a police officer'.' He then slammed Lau's head into the wall twice before summoning a duty officer, the jury heard. The duty officer then examined his head, Lau said. He was later taken to Queen Elizabeth Hospital, where officer Choi Chun-fai warned him against revealing the source of his injuries, the court was told. Lau has pleaded guilty to manslaughter but denies murder. The teenager was on the run when police stopped him at a roadblock on July 22. When the officers checked his identification, he knew they would discover he had jumped bail on a robbery charge. He made a run for it but Hon blocked his path and a struggle followed. Both men fell over and the court heard the young officer was shot dead after he refused to let go of Lau. Lau told the jury he was wrestling for control of the officer's gun when the young constable was shot three times. 'There was such confusion,' he said. 'What I was thinking was not to have the barrel pointing in my direction.' After firing the fatal shot, the fugitive swung the weapon towards his victim's partner, Constable Wong Yu-hoi. But Constable Wong was saved by the swift action of officer Leung Lai-fun, the court heard. She jumped on the gunman and yanked his head back by the hair, sending the shots wild, the jury was told. The hearing continues.