The violence and vandalism carried out by a group of young people in Tarneit is worsening and police are not doing enough to control the lawlessness, residents say.

Police have vowed to crack down on a group of youths who are regularly drinking and fighting in the area.

The group gathers at a local park and the Tarneit McDonald's, where a fight involving between 100 and 150 youths erupted on Sunday night.

Homeowners' windows have been smashed, and the park has been trashed.