Four Britons released from Guantanamo Bay prison camp and re-arrested on their return home are being questioned by police in London.
A police convoy carrying four Britons arrives at Paddington Green police station in central London last night
A fifth walked free last night for the first time in over two years.
The five, held since late 2001 or early 2002 along with more than 600 others suspected of fighting with the Taliban in Afghanistan or supporting al-Qaeda, had flown from the camp in Cuba and landed at a military air base outside London yesterday evening.
Mr Ruhal Ahmed (22), Mr Asif Iqbal (22), and Mr Shafiq Rasul (26), all from Tipton, West Midlands, and Mr Tarek Dergoul (26), from London, were arrested under section 41 of the Terrorism Act 2000 after arriving in Britain and are being questioned at Paddington Green police station in west London.
The released man, Mr Jamal al Harif (37), from Manchester, was detained at RAF Northolt for questioning but was then freed without charge and left the base in a police convoy.
His lawyer, Mr Robert Lizar, expressed anger at how Mr Harif, also called Jamal Udeen, had been treated at Guantanamo and called for justice for him from Britain and the United States.
"He has been treated in a cruel, inhuman and degrading manner, he wants the authorities to answer for that," Mr Lizar said. "He believes that the UK authorities have also been complicit in terms of being involved in questioning him while in detention and allowing that to continue."
"He is an innocent man and he wants to know why was he kept in custody for so long. He is now due to be released."
The long detention of inmates in Guantanamo without trial or access to lawyers has been denounced by human rights campaigners. Images of Guantanamo beamed around the world showed shackled prisoners being kept in cages.
"They have treated my son like an animal," said Mr Riasoth Ahmed, father of one of those arrested. "He has been held in a cage in Cuba for two years without any charge and with no access to a lawyer. He has been interrogated for two years. Surely they have got all of the answers they want by now?"
Police said the four arrested would be given medical examinations to ensure they were fit to be detained and questioned. They would be allowed to make a phone call and speak to a lawyer.
If police decide there is no case against the men under Britain's anti-terror laws, they may be freed in days. The five were considered a low security risk by US authorities. Fourother Britons are still at Guantanamo.
US authorities say that of 100 inmates released from Guantanamo, 88 were allowed to go free in their home countries, while 12 were kept in detention - four in Saudi Arabia, seven in Russia and one in Spain.