TWO men suffered severe burns in a gas explosion which rocked a building in Tai Hing Estate, Tuen Mun, last night. The blast appeared to have been part of a suicide attempt. Neighbours ran from their flats to see Woo Kin-fai, 33, lying on the ground with his hair and clothes burning. Inside the flat was Lau Chung-cheung, 35, unconscious on a burning bed. The neighbours put out the flames and carried the two men downstairs to wait for an ambulance. Police found a tube on the gas stove cut and a suicide note. Mr Woo had gone to visit Mr Lau and found the door open. The explosion occurred when he switched on the light.