Two further arrests have been made in connection with an investigation into the death of a father who was out celebrating the birth of his baby.
Police have arrested two 23-year-old men on suspicion of violent disorder and assault following the death of Benji Bolsenbroek. Both have been bailed.
Four men and four women have already been bailed in connection with the investigation.
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Stephen Unwin and William McFall were handed whole life sentences for the brutal murder of 28-year-old Quyen Ngoc Nguyen last August.
Part of the eastbound carriageway in Middlesbrough was closed for several hours and will be reduced to one lane in the coming days.
Three horses have died in separate incidents at Hexham racecourse. The British Horseracing Authority has said it is investigating.