Canadian authorities have opened a criminal investigation into a deadly oil train derailment that killed at least 15 people over the weekend.

François Laplante-Delagrave/AFP/Getty Images

Quebec police inspector Michel Forget told a news briefing Tuesday that investigators have "discovered elements" that have led to a criminal probe.

Forget did not give details, but he ruled out terrorism.

Officials say 50 people are still missing from Saturday's disaster, including those dead.

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