Three people have been injured in two separate crashes in the South Island tonight.

The first, in Koromiko, Marlborough, at around 10.20pm, resulted in two people being taken to Blenheim Hospital, St John Ambulance said.

They were both in a moderate condition.

The second happened around 10.50pm on the Rangitata Highway, St John said.

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One person was treated at the scene and taken to Ashburton Hospital in a moderate condition.