A FORMER FBI agent and alleged torturer should have been arrested on arrival at Parliament yesterday, a human rights group has said.

Ali Soufan was hosted by the right-wing Henry Jackson Society on Thursday as a guest speaker at the House of Lords to promote his new book Anatomy of Terror.

But Mr Soufan’s invitation stirred controversy as the former FBI agent faces accusations of complicity in the torture of Qatari businessman Ali al-Marri on US soil.

Human rights group Cage published more than 35,000 pages of evidence in April that it says shows Mr Soufan may even have overseen Mr Marri’s torture.

Cage subsequently instructed lawyers to seek a warrant for Mr Soufan’s arrest. The complaint is currently being dealt with by the Metropolitan Police’s War Crimes Unit.

Mr Marri accused the Henry Jackson Society of “seeking to legitimise Ali Soufan, the man involved in my torture on US soil, by hosting him at the House of Lords.

“My complaint to the police has been submitted in advance. They should arrest this man and take him into custody on arrival!”

He added: “It is completely beyond me as to why the UK would have this contemptible individual invited to the House of Lords to promote his book, profiting from his background as an FBI torturer.”

Cage’s outreach director Moazzam Begg — who was imprisoned at Guantanamo Bay for nearly three years — called on the director of public prosecutions to “live up to its obligations under international law and arrest Soufan to investigate the allegations made against him.

“People in power should no longer escape accountability — as has been illustrated in part by Theresa May’s apology to [former Libyan Islamist militant leader] Abdelhakim Belhaj and his wife Fatima Boudchar.”