A 14-year-old gang member has been arrested over the near-fatal abduction of a Melbourne student as he walked home from school.

The boy, who police say is a known youth gang member, was arrested after a 14-year-old student from Glen Eira College was forced into a car and left seriously injured in Glen Huntley on Monday afternoon.

Inspector Scott Dwyer said police believe he was the main offender and flagged more arrests in coming hours.

“We have identified all those persons we believe responsible for that attack and their arrests are imminent,” he told reporters on Thursday.

About 10 minutes before the attack, two people armed with machetes robbed four teenagers of their mobile phones and other personal belongings.

Detectives are yet to confirm whether the armed robbery is linked but believe the attackers were targeting students after school.

Insp Dwyer said the number of Victorian youth offenders aged 10 to 17 is rising, with police monitoring 598 youth gang members across 44 gangs.

Of those, 444 have been arrested more than 1600 times during the past 12 months.

“That shows the level of commitment we have to targeting youth gangs,” he said.

Extra patrols have been rolled out in the Glen Eira and Bayside areas, near where the incident happened.

Uniformed and mounted branch officers are focusing on areas around schools but Insp Dwyer urged the public not to be alarmed.

“Just because you see police in key locations doesn’t mean that that is a dangerous area,” he said.

“We are there to … deter crime as much as we are to investigate it.”

The investigation remains ongoing and anyone with information has been urged to contact police.

– AAP