Ontario Provincial Police say a highway between the northern communities of White River and Hornepayne is closed due to a forest fire causing "extremely dangerous conditions" in the area.

Police have posted photos online showing heavy black smoke alongside Highway 631. Conditions had improved enough for the highway to reopen at 11 a.m. Tuesday, said OPP Const. Ashley Nickle, but changing winds around 2 p.m. caused zero visibility, causing another closure.

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