ISIS leader Abu Bakr al-Baghdadi has called on jihadists to free detainees held in jails and camps in what is believed to be his first public statement since April.

In a 30-minute audio recording released late on Monday, the Islamist questioned how a Muslim can enjoy life when Muslim women are held in “prisons of humiliation run by crusaders and their Shia followers.”

While urging those held in camps to be patient, he called on Isis militants to do all they can to spring the jihadists. He also called for interrogators and judges that are quizzing Isis fighters to be targeted.