Answer
Abu Bakr al-Siddiq Battalion, a Libyan militia, announced Saif al-Islam's release in 2017. Saif al-Islam Gaddafi, the son of former Libyan leader Muammar Gaddafi, had been captured in 2011 and was released by the militia after six years in captivity. The militia took control of the town of Zintan, where Saif al-Islam was being held, and negotiated his release with the government.