Relatives put on no-fly alert after family member arrested in US Hong Kong airport authorities have prevented two men - relatives of a man in custody in America who is facing terrorism charges - from continuing their journey to the United States, forcing them to return to Pakistan. The action has raised questions in the United States about the right of authorities to deprive relatives of terrorism suspects of their rights. In this case, both the men were also US citizens. Legal representatives for the men said yesterday that Hong Kong airport authorities prevented Muhammad Ismail, 45, a US citizen born in Pakistan, and his son Jaber, 18, born in the US, from continuing their journey from Pakistan to the US on April 21. The men are an uncle and a cousin of Hamid Hayat, 23, who has been in custody since April after admitting to the FBI that he had trained at an Al-Qaeda camp in 2003 and 2004, where he learned to 'kill Americans'. They were picked up in transit in Hong Kong. Officials said Hayat told FBI interrogators Jaber Ismail had also attended the camp. Julia Harumi Mass, from the American Civil Liberties Union, said the father and son were picked up on their way home to California, where a jury was deliberating on the charges against Hayat. The men were travelling with other members of their family who had been living in Muhammad Ismail's home village in Pakistan. Ms Mass said in a letter to the US Department of Homeland Security last month that the men and the rest of their family had been permitted to board a plane in Islamabad without incident. 'In Hong Kong, airport officials inspected their passports and told the family Muhammad and Jaber Ismail could not fly to the United States but the remaining members could continue the journey,' she said. 'The family was given no explanation except that there was 'no record' of Muhammad and Jaber Ismail in the United States and their passports did not 'come on' to the computer.' The men then had to pay to return to Pakistan while the rest of the family continued on to America. She said the rest of the family had no choice but to continue their journey because they could not afford the extra air fares to return to Pakistan. Customs authorities would not confirm whether they had taken action against the two men. The men again attempted to return to the US in late July after seeking advice from US consular officials in Pakistan, but this time were told they were on a 'no-fly' list. US government officials said the men would remain on the list until they agreed to talk to FBI investigators. They have so far declined to do this, the government claims. However, Ms Mass said Jaber Ismail had been interrogated by FBI agents in Pakistan and that the FBI had wanted to question him further, but he refused to do so without legal counsel. 'The only reason given by the FBI agent who spoke to Jaber Ismail was that Jaber had listed his uncle, [Hamid Hayat's father] Umer Hayat, as an emergency contact on his passport application and that Mr [Hamid] Hayat had been arrested on terrorism charges,' Ms Mass said. 'The fact of being related to a person accused of a crime does not justify such a detention and denial of rights.'