A mentally ill British man accused of trying to set up a terrorist training camp in Oregon has been extradited to the U.S. after losing a nine-year legal battle.

London's Metropolitan Police says Haroon Aswat was taken Tuesday from a psychiatric hospital and escorted onto a plane by U.S. officials.

Aswat is accused of conspiring with radical cleric Mustafa Kamel Mustafa — also known as Abu Hamza al-Masri — to set up a terrorist training camp in Bly, Oregon, 15 years ago.

Aswat had been fighting extradition since his arrest on a U.S. warrant in 2005, and has been treated for paranoid schizophrenia.

Last month Britain's Supreme Court ruled that Aswat could be extradited after receiving assurances from U.S. authorities that he would continue to be treated for his condition.