A man is in hospital in a critical condition after an attack close to a Rotherham roundabout.
Officers were called to Midland Road at its junction with Garden Street, Masbrough, at 6.25pm yesterday following initial reports that a man had been involved in a collision.
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But South Yorkshire Police said an assessment of his injuries at hospital indicated that the man, in his 30s, had been seriously assaulted.
He remains in hospital this morning in a critical condition.
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Midland Road is closed while investigations take place at the scene.
Witnesses should call South Yorkshire Police on 101 and quote incident number 666 of February 4.