A 'full-time triad' was yesterday jailed for his part in an attack on two policemen after a convenience store security film revealed his identity. Passing sentence at the District Court, Judge Fergal Sweeney described Lam Ching-yan, 20, as a 'full-time triad member'. He jailed Lam for four years and eight months after he pleaded guilty to two charges of wounding with intent. Judge Sweeney said the attack was premeditated as another defendant, Wong Leong, had been waiting in a getaway taxi nearby. Prosecutor Melville Boase said that late on May 5 the two victims, Chiu Man and Kwong Sze-yeung, went to have a meal with seven other policemen in Causeway Bay. Mr Chiu, 22, went to a nearby convenience store to buy a soft drink. Lam and Wong entered the store and one of them blocked Mr Chiu's way and bumped him. They stared at each other before Mr Chiu left the shop to rejoin his colleagues at a pavement restaurant. At about 1 am, Mr Chiu and Mr Kwong were attacked by Lam and an unknown man, while Wong waited in a taxi nearby, the court heard. Mr Chiu was cut on his left arm while Mr Kwong had a 20-centimetre chop wound in the face. After the attack Lam and the other man fled and jumped into the waiting taxi. Lam and Wong were arrested later at the Lowu border crossing after the police obtained a security video showing them at the store. Wong, 17, was earlier found guilty of two charges of wounding with intent and will be sentenced on September 29. The other man involved in the attack is still being sought by police.