'Wolf in sheep's clothing': suspect in French terror attack

Co-worker of Yassin Salhi, 35, said he was mysterious, had a quiet strength, was deceptively calm and had talked about Islamic State.

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Yassin Salhi was a quiet man with a job, a family and no criminal record before he allegedly launched a grisly assault at an industrial gas factory in France and pinned his boss's severed head to the fence on Friday, reports Yahoo! News.