The A14 and Orwell Bridge were closed in both directions following a police incident.
Officers were called to an incident at about 11am on Monday.
A spokesman for Suffolk police said officers were in attendance.
According to traffic sensors, there were severe delays in the area.
It came as drivers were facing severe delays in the westbound carriageway near Stowmarket following a crash earlier in the morning.
The westbound carriageway is closed at Claydon following a crash involving two lorries.
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