A hit-and-run incident on the A140 saw two cars collide and one of them hit a tree.
The incident happened at Wetheringsett on Saturday at about 10pm.
A red car was in collision with the back of a blue Seat Ibiza, causing it to leave the carriageway and hit a tree. The red car temporarily stopped before driving off travelling northbound on the A140 towards Eye.
The driver of the blue Seat sustained knee and hip injuries, while his passenger sustained a head injury. Both were taken to Ipswich Hospital by ambulance.
Police would like to hear from anyone who witnessed the incident or the driver of the red car to come forward by calling PC Sandra Wiggins from Stowmarket on 101.