Mehmet Ali Agca, the man who tried to kill Pope John Paul II in 1981, proclaimed the world will end this century as he was released from prison in Turkey.

Agca has promised to explain his motives for the failed assassination attempt in 1981 but questions about his mental state and outlandish claims have raised doubts over whether the mystery will ever be solved.

He was taken to a Turkish military hospital where doctors concluded that he was unfit for compulsory military service because of a “severe anti-social personality disorder,” said his lawyer, Yilmaz Abosoglu.