Lawyers for the only known survivor of a group of Islamist militants who killed 130 people in Paris last year on Wednesday resigned from the role, saying his continued refusal to testify was due to the conditions of his detention.

Salah Abdeslam, who has been held in solitary confinement near Paris since he was captured earlier this year, does not want to talk and no longer wants legal representation, his lawyers Frank Berton and Sven Mary said on BFM Television.

"We are convinced, and he told us so, that he will not talk and will use his right to remain silent. What can we do. I have said it from the beginning, if my client remains silent, I drop his defense," Berton said.