Gangster Yip Kai-foon yesterday had six months added to a jail term of more than 36 years he is serving, after being convicted of assaulting a prison officer. Yip was jailed in 1997 and is serving the term for kidnapping, shooting at police, possessing explosives, escaping from custody and other charges. He will be almost 70 when he is released. Yip was convicted in Eastern Court yesterday of assault occasioning actual bodily harm. He attacked the officer in Stanley Prison on April 30 as a wound was being cleaned. Acting Principal Magistrate Bina Chainrai said it was an unprovoked attack by Yip on the officer, Ku Yuen-for, and it was only by the greatest fortune that the officer had not suffered more serious injuries. She said Ku's recollection of the incident matched CCTV footage of the cell where the attack took place. In contrast, Yip, who denied the attack, had been evasive when explaining his actions at the time. In mitigation before sentencing, Yip's lawyer, Kevin Tang Tsz- kai, said his client had already lost privileges in jail as a result of the offence. Furthermore, the actual bodily harm Ku suffered was minimal, with one witness saying he only sustained a superficial injury, Tang said. Yip gained notoriety for robbing jewellery stores in the 1980s and 1990s and spraying bullets from an AK-47 as he made his getaways. He was left wheelchair-bound after a gun battle with police in 1996. Yip was sentenced to 30 years in 1997 after he was convicted of possessing arms and ammunition, using a gun to resist arrest, and having 1.8kg of explosives with intent to endanger life or property. However, that sentence was to be served on top of a 16-year term he was given in 1985 for firearms offences. His total sentence was later reduced to 36 years and three months on appeal. Yesterday's six-month sentence must be served consecutively.