Investigators believe they travelled to the Greek island of Leros on October 3 on the same boat full of refugees as two men who took part in the November 13 attacks.
Muhammad Usman, a suspected bomb-maker for the Pakistani terror group Lashkar-e-Tayyaba, had set out from the capital of the self-declared Islamic State caliphate in Raqqa, Syria, six weeks before the Paris attacks along with Algerian-born Adel Haddadi, the report said, citing investigation documents.