Frank Berton and Sven Mary said they've decided to stop representing Salah Abdeslam, who has chosen to remain silent in a protest against his prison conditions, including the 24- hour video surveillance of his cell.
Berton told a press conference today that Abdeslam, who was arrested in Brussels in March then transferred to France, was psychologically damaged by his detention at Fleury-Merogis prison.
"I've been convinced for months that he is isolating and radicalising himself, he is taking his video surveillance very badly," Berton said. "This is not blackmail, it's just the reality of his psychological and psychic state. The problem is related to his solitary confinement."
Authorities hope Abdeslam can provide information about the Islamic State group's strategies and networks, and identify others who might have had a connection to the November 13 attacks, which killed 130 people.
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The same network attacked Paris struck again in Abdeslam's hometown of Brussels in March, days after he was arrested in his hideout.
Berton previously argued that two round-the-clock video cameras in Abdeslam's could cause psychological damage, but France's top administrative authority rejected the lawyer's request to remove them. Judicial authorities argue the surveillance is needed to ensure he doesn't commit suicide.
Abdeslam, 27, had initially said he wanted to explain his path to radicalisation and his role in the attacks on the Bataclan concert hall, cafes and the national stadium. The other attackers died in suicide bombings or under police fire.
Abdeslam's role in the attacks has never been clear. The Paris prosecutor has said he was equipped as a suicide bomber that night, but abandoned his plans and fled.
He evaded police for four months, but was arrested in the Brussels neighborhood where he grew up. He was later extradited to France and faces several preliminary terrorism charges.
"He is going to be accused of all crimes and will be responsible for all.... There will be a trial, but what for? The truth never came out of silence."
Berton added that Abdeslam refused to speak to a judge twice since his transfer to France and skipped another hearing.