Witnesses are being asked to come forward after a Cliff Park school bus and a 4x4 collided on Lowestoft Road near Hopton.
A child was taken to hospital with minor injuries after the crash which happened at around 3.30pm on Friday, January 15.
In a statement, a spokesman for Norfolk Police said: 'A small light coloured car stopped abruptly, without warning, on the inside-lane, causing a coach full of school children to take avoiding action.
'In doing so a Range Rover collided with the rear of the coach and a Fiat Punto.'
The A12 southbound was partially blocked between Bridge Road junction and Links Road junction while emergency services attended the scene.
• The police ask anyone with information, especially about the light coloured car, to contact PC Olly Ketteridge at Norfolk Constabulary on 101 or call Crimestoppers anonymously on 0800 555111 or through their anonymous online form at www.crimestoppers-uk.org.
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