Police were called about 10pm ” about an hour after the finish of the Avon River Festival.
One officer was allegedly punched in the face, resulting in a cut above his eye. He was later treated at Northam Hospital.
Chris Wride, acting officer in charge of Northam police, said police already had a number of specialist units in the town for the festival.
‘We had 10 riot police and two horses,’ he said.
‘There were four arrests on the night. The people involved in the fight were locals and it was mostly pushing and shoving.’
Sgt Wride said despite community fears that anti-social behaviour was spinning out of control, police were receiving fewer reports than in the past.
According to Sgt Wride, Fitzgerald Street remains a hotspot for anti-social behaviour.
The Shire of Northam is combating the issue with the installation of CCTV cameras. Three have been installed and the Shire has funding for two more.