Stationary traffic and one lane closed due to accident, four vehicles involved on A31 Poulner Hill Westbound between Picket Post Services (Burley Turn Off) and Eastfield Lane (Ringwood).
The accident happened at around 11:15, with queues back towards Stoney Cross. Lane two (of two) remains closed, though traffic is now able to pass the scene.
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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