Exiled Cambodian Prince Norodom Sirivudh, who is accused of plotting to kill his country's co-premier, was stranded in the territory last night. Dragonair refused to let him board a flight to Phnom Penh amid alleged threats to put the aircraft 'in danger'. Prince Sirivudh was issued with a boarding pass by the airline on his arrival in the territory from Europe yesterday morning and had hoped to fly on later in the day. But three hours before the take-off at around 4 pm, Dragonair banned him from boarding saying the Cambodian Government had told them he did not have valid travel documents and would not be allowed into the country. Prince Sirivudh, 45, has served as a deputy prime minister and minister of foreign affairs in the current Government. He is a half-brother of King Norodom Sihanouk and an uncle to First Prime Minister Prince Norodom Ranariddh. Last night the prince was understood to be still inside Kai Tak airport's transit area as officials tried to broker a deal to fly him to Phnom Penh on a Royal Air Cambodge flight tomorrow. Dragonair spokesman John Bailey said: 'In the circumstances and under industry rules we had no alternative but to deny him boarding.' Prince Sirivudh accused the airline of 'quite bizarre' behaviour and said he would remain in the transit area until he found a way to fly out. 'I am a Cambodian carrying a diplomatic Cambodian passport. I am sorry to have disturbed the authorities of Hong Kong and I thank them. I just want to transit.' The prince said Dragonair representatives had told him they had received a threat from the Cambodian Government that any flight carrying him would be 'put in danger'. Diplomatic sources said Dragonair was worried about possible dangers to other passengers. An airline spokesman said: 'We cannot confirm that information.' Prince Sirivudh was convicted of plotting to assassinate Second Prime Minister Hun Sen in March 1996 and sentenced to 10 years' jail in absentia. Cambodian government officials said earlier yesterday that he would be arrested on arrival.