TRIPOLI - Al Baghdadi al-Mahmoudi, a prime minister under deposed Libyan leader Muammar Gaddafi, is in critical condition after being tortured in a Libyan jail, his Tunisian lawyer said on Wednesday.

An officer at the prison where Mahmoudi is held denied this.

Mahmoudi was extradited from Tunisia in June, making him the first senior Gaddafi official to be returned for trial under Libya's new leadership.

He went on trial in November charged with corruption and ordering mass rape during the 2011 conflict that toppled the Libyan leader and is being detained in a Tripoli prison.

"Mahmoudi risks dying. He has been tortured for the last 45 days, he is in critical condition," Mahmoudi's lawyer, Mabrouk Khorchid, based in Tunis, told Reuters.

"We are very worried about the state he is in, we will launch an international campaign to save his life."

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