A murder investigation has been launched after a young boy from Hampshire was killed in a crash.
Emergency services were called to the A354 at East Woodyates, north Dorset, at 5.21pm on Monday to reports of a collision.
It involved a grey Citroen DS9, a white Ford Transit Van and a DAF cattle transporter vehicle and trailer.
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The boy, from Hampshire, was a passenger in the Citroen and died at the scene, police said.
Dorset Police said the driver of the Citroen, a woman in her 30s from Hampshire, has been arrested on suspicion of murder and a driving offence.
She was taken to hospital for treatment for unspecified injuries and remains in police custody.
The force has appealed for any witnesses or anyone with dashcam footage of the incident to come forward.
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