A 14-year-old boy has been injured in a fight that erupted as families celebrated Halloween on a residential street in Melbourne's west.

Emergency services were called to Avonwood Avenue in Wyndham Vale about 6.15pm yesterday following reports a boy had been injured.

CCTV footage from the residential street shows two boys sprinting away from a group of armed offenders before one of them is kicked and another is punched.

Police allege the group, one armed with a kitchen knife, approached the victim before he was assaulted.

The group of five fled on foot before emergency services arrived.

The 14-year-old was treated at the scene for a minor injury.

Residents say the boy's friend jumped into backyards to hide and pleaded with them for help.

The horrifying violence shocked familie

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