Ballistics officers are examining an automatic pistol found in a fast-food shop in Sheung Wan yesterday, believing it might have been used in the hitman murder of a wealthy businessman in a teahouse on Saturday. The discovery of the weapon abandoned at the Shun Tak ferry terminal indicates that the killer fled Hong Kong soon after the shooting. Police stepped up their investigations into the slaying of Harry Lam Hon-lit by last night offering a $1 million reward for information leading to the arrest of the gunman. They also issued new colour drawings of the suspect and the black backpack he was carrying. A Chinese-made Black Star 7.62mm pistol, loaded with five bullets, was yesterday found wrapped in clothing in a backpack found in the Shun Tak Centre. The bag was discovered under a chair in the 88 restaurant by a cleaner on Saturday afternoon, but it was not until yesterday that the restaurant manager looked in the bag. The weapon is now with the Forensic Firearms Examination Bureau. Former race horse owner Lam was shot dead by the gunman while eating breakfast with three friends in the Luk Yu Tea House in Stanley Street, Central. He was killed with a single bullet to the head. Police Commissioner Tsang Yam-pui said the killing of Lam was meticulously planned and may have cross-border connections. He said the gunman had planned the murder, knew his target well and carried out the killing in a clean and swift manner. Organised Crime and Triad Bureau officers yesterday said they had been examining departure lists for ferries from the Shun Tak Centre terminal in an attempt to identify the killer. A senior investigating officer said: 'We are not jumping to the conclusion that the gun was the weapon used by Lam's killer nor that the hitman has left Hong Kong, but since the gun was found in Shun Tak, we are not ruling out the possibility the owner abandoned it before leaving Hong Kong, either for Macau or the mainland, by ferry.' The departure terminal for both Macau and the mainland is one floor above the fast-food shop where the pistol was found. A police spokesman said anyone who knows the identity or whereabouts of the killer or has other information on the case should contact the police. They can call the police hotline on 2527 7177, the OCTB on 2860 8366 or fax the information to 2520 2828. The putonghua speaking killer is aged 28 to 30, about 1.6m tall, with short hair, a dark complexion and thin build.