The M6 in Cumbria is blocked in both directions at Kirkby Lonsdale (J36), due to snow.
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The two grenades were on board a fishing boat heading for Stranraer harbour.
Storm Doris is set to bring wet, windy and wintry weather to the region.
Carl Hodgson, who lives in the town, was sentenced to three years and six months behind bars at Manchester Crown Court today.