CRASH UPDATE: Police followed a Mercedes van as it sped along Bursledon Road in Southampton, jumping red lights. The van crashed into a yellow Citroen Saxo. The van driver ripped off his fluorescent jacket and shirt and ran from the scene.
Bare-chested, he ran through Thornhill Estate and was seen trying to run between cars on the M27 between junctions 7 and 8. A man was later detained in Sainsbury's on suspicion of stealing a shirt. He is being interviewed at Southampton Central Police Station. The Saxo driver has minor injuries.
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The 22 year old man is seriously injured in hospital. Police believe a baseball bat and iron bar may have been used in the attack