An Avon and Somerset Police spokesman said: "Two people have been arrested on suspicion of causing death by dangerous driving."
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A prison officer - who was allegedly assaulted by a prisoner at a crown court - has died.
The body of the girl, who is thought to be about four, was found washed up in a bag in Boston.
Australian Rules football has been left in shock after the son of Adelaide Crows coach Phil Walsh was charged with his murder.