The Transport Secretary Justine Greening has visited the Humber Bridge to mark the halving of the toll motorists must pay to cross it. It's claimed the cut will provide a £250m boost to the local economy. It now costs one pound fifty for cars to make a one way trip over the bridge
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The men, all aged 19, were arrested on Tuesday.
Zena Victoria Jackson, 43, and her six-year-old daughter Cidalia Mendes-Jackson died after being hit by a lorry on Spring Bank in April.
Andrew Broadhead, 42, and his eight-year-old daughter Kiera died in the blaze at their home in Stanley in October.