Seven officers have been taken to hospital following a collision involving five police vehicles and another car which was being pursued on Tyneside.
Northumbria Police said the crash happened on the northbound A1 near the Derwent Haugh Road junction, on the borders of Gateshead and Newcastle, at 2.27am on Wednesday.
The force said seven officers were taken to hospital with what it described as non-life threatening injuries.
Four have subsequently been discharged, two remain for observation and one is receiving treatment to a leg injury.
A spokesman said the two occupants of a BMW, which was being pursued at the time, were uninjured.
A man in his 20s has been arrested on suspicion of causing serious injury by dangerous driving, he said.
A woman, also in her 20s, has been arrested on suspicion of aiding and abetting dangerous driving.
Both remain in custody.
The collision happened on the A1 carriageway below the roundabout where gunman Raoul Moat shot Pc David Rathband, leaving him blind, in 2010.
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