LAWYERS for the Batley parents of Haroon Rashid Aswat are pressing the Government to gain immediate consular access to their son - arrested as a terror suspect.
They fear that the US may be seeking to extradite him from Zambia to Guantanamo Bay in Cuba.
Aswat, who was previously linked as an alleged accomplice to the 7/7 London bombings, is reportedly being held in Lusaka, the Zambian capital, since crossing into the country from South Africa more than a week ago.
He grew up in Batley and his family still live there.
A spokesman for the family said: "We are extremely concerned by the attitude of the Government in not providing consular access to Haroon.
"Our son, albeit estranged for many years, is surely entitled to the presumption of innocence as any other British citizen."
Human rights lawyer Gareth Peirce feared the US government might be trying to extradite the British-born Muslim "to the US or elsewhere," particularly in the light of the way the Americans have treated UK citizens held in custody in recent years.
Aswat, 31, a British citizen of Indian descent, was originally linked with the 7/7 attacks after police reportedly discovered that calls had been placed from his cellphone to some of the four suicide bombers.
It was suspected that he may have been the mastermind behind the attack.
Since then he was reported to have been arrested in Pakistan with a belt of explosives. But it was apparently a case of mistaken identity.
Meanwhile the Italian authorities were today considering whether to hand back one of the four July 21 London bombing suspects.
The move comes as UK police continue to question a growing number of people arrested in connection with the attacks.
Documents relating to Britain's bid to extradite Hussain Osman, the man alleged to have tried to bomb Shepherd's Bush Tube station, were expected to arrive in Italy today.
Osman, the last of the four July 21 would-be bombing suspects to be held, was arrested in a flat in Rome on Friday.
Seven suspects were taken into custody yesterday.
The six men and one woman were arrested in Brighton, Sussex.
It brings the total of those being held to 19.