Four charged over violent Melb robberies

Four teenage boys have been charged over a series of robberies in Melbourne suburbs since March.

Three 16-year-olds and a 15-year-old each face more than 10 charges including robbery, violent disorder and intentionally and recklessly causing serious injury.

Police allege the youths, who were arrested on Monday, are responsible for a 45-year-old man being found unconscious in Melbourne's west in March, who remains in hospital for his injuries.