Police say the incident happened sometime between 00:00 and 00:30.
Officers also say that the temporary roadwork fencing in the road was knocked over during the altercation.
Police are looking to speak to anyone who was in the area or who witnessed the incident. Anyone with information is asked to contact the Investigations Support Unit on 01481 725111.
Pictured top: Guernsey Police is investigating an altercation in the early hours of Sunday morning.