A motorcyclist and his passenger were killed and 17 people injured in a six-vehicle pile-up yesterday in the Tate's Cairn Tunnel - the worst accident there since the tunnel opened 10 years ago. Rider Wong Ping-chi, 39, and Yu Tin-wai, 21, died when they were trapped under one of three lorries. A KMB driver, Lau Kwok-leung, 52, who was trapped behind his wheel, was in critical condition in Princess Margaret Hospital after being rescued by firemen. Two KMB buses, three trucks and the motorcycle were heading from Sha Tin to Kowloon at 4.15pm when the accident happened in the left lane, half-way through the 4km tunnel. Two of the trucks and the motorcycle were sandwiched between the two buses. Wong and Yu were rescued by firemen but declared dead on arrival at hospital. Four of the victims, including Tam Yuk-lin, 76, were in serious condition. The other injured were taken to the Prince of Wales and Queen Elizabeth hospitals and later discharged. The tunnel's Kowloon-bound lanes were closed immediately and emergency exits were opened inside the tunnel to evacuate more than 100 people. On April 27, Sham Ka-kei, 18, was killed when a lorry he was travelling in crashed into the back of a rubbish truck near the entrance of the Kowloon-bound lane of the tunnel.