Six people were treated at Poole hospital after two cars collided on Lindsay Road in the early hours of Sunday morning.
The vehicles were a grey Renault Clio driven by a man aged 18 and a silver Peugeot taxi driven by a male aged 37.
The injured passengers, all travelling in the Clio, were a male aged 19, a woman aged 26 and two teenage girls aged 17.
Police are appealing for witnesses.
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