Part of the A12 is closed in both directions following a multi-vehicle crash.
Police were called to reports of a collision on the major route in Frostenden just after 2.30pm.
Two vehicles were involved in the crash which has blocked the road.
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The East of England Ambulance Service are also in attendance.
A spokesman for the police said recovery is on its way to the scene.
Traffic sensors show long delays in the area with witnesses saying traffic is being diverted through Southwold.
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