Two youths were arrested in Lakelands on Saturday night after two Mandurah police officers were bashed.
The officers had responded to reports of a large number of youths who had gathered near the Madora Bay lookout at Eleanore Drive about 7pm.
Police will allege the youths were acting disorderly, smashing bottles and were seen with eskies and alcohol.
Several police vehicles attended and dispersed the youths.
But about 9pm, the remaining youths moved on to Catalina Drive and to a house in Cohen Vista in Lakelands where they became violent towards police.
A sergeant from Mandurah Police Station was dealing with the youths when he was hit on the back of the head by another youth.
A senior constable from the Traffic Enforcement Group assisted the officers and was also hit in the head.
Police arrested two youths and the remaining youths left the area.
The sergeant was taken to Peel Health Campus by ambulance. He sustained serious concussion, soreness to skull and shoulder and remained in hospital under observation.
The senior constable sustained minor bruising.
A 17-year-old boy from Coodanup was charged with assaulting a public officer and escaping custody. He will appear in Mandurah Children’s Court on June 19.
A 17-year-old boy from Dudley Park was charged with assaulting a public officer and obstructing a public officer. He will appear in Mandurah Children’s Court on June 19.