Hong Kong yesterday said it would consider raising its travel warning to Bangkok to the most severe level - black - if the situation in the Thai capital continued to deteriorate. The warning came as Hong Kong travel agents cancelled some 20 package tours scheduled to leave for Bangkok between today and Tuesday. Of the 3,000 Hong Kong residents in Thailand, about 1,000 are on group tours and are expected to return by Sunday. The rest are independent travellers. Secretary for Security Ambrose Lee Siu-kwong said the Hong Kong government was contacting airlines to ensure arrangements were in place to bring residents home if needed. A red alert has been in force since March 10, which means non-essential travel to Thailand should be avoided. Under a black alert, residents are advised against making visits. But one Hong Kong holidaymaker said: 'We shall mainly stay in the hotel or hang around in the neighbouring areas of the hotel. It should be safe.'