Two Vietnamese illegal immigrants who hid under a truck to sneak into Hong Kong from the mainland were arrested after one tried to climb out and was run over by its rear wheel in Sha Tin yesterday. The injured man, 38, was in critical condition in Prince of Wales Hospital and the other man, 24, was unhurt. The incident happened as the truck, which arrived from Huizhou, was making a turn from Tai Chung Kiu Road at about 2am.