A 16-year-old boy has been charged with murder after a teenager was allegedly stabbed and dumped outside a medical centre in Melbourne.

The victim was named in the media as Darweish Mohamed, with tributes flowing for the 15-year-old and a GoFundMe raising nearly $35,000 for his family.

He was found critically injured outside Craigieburn Community Hospital in Melbourne’s north, about 7.50pm on Wednesday.

A staff member from the clinic rushed to his aid and delivered CPR, but he died at the scene.

About 5.30am on Thursday, a 16-year-old boy and a 20-year-old man were arrested in the nearby suburb of Pascoe Vale.

The 16-year-old from the Goulburn Valley was charged with murder on Friday morning and will appear in the children’s court at a later date.

The 20-year-old Beveridge man has been charged with criminal damage by fire and bailed to appear at Broadmeadows Magistrates’ Court at a later date.

A 15-year-old girl from the Fawkner area was arrested on Thursday night and has been charged with affray and theft of motor vehicle and bailed to appear in a children’s court at a later date.

A 15-year-old Craigieburn boy was arrested on Friday morning and is being interviewed.

Investigators were on Thursday afternoon continuing to gather evidence and were seen door-knocking nearby homes.

A young man was seen arriving outside the clinic to place a framed picture of the dead boy and a bunch of white flowers.

A bouquet of yellow flowers was also left on a nearby bench, with a note asking “when will these postcode wars end?”

“Another senseless, tragic life taken far too soon. RIP dude,” the note read.

“Love + thoughts are with your family + friends.”

A GoFundMe fundraiser was created to support Darweish’s family with funeral costs and any other expenses they may face.

“It is with heavy hearts that we share the passing of our beloved brother, Darweish,” said the GoFundMe page.

“No family should ever have to go through a loss like this, and our hearts are with his loved ones during this incredibly difficult time.

“Every donation, no matter how small, will make a difference and help ease some of the burden on his family.”

Northern Health, which operates the medical centre, said it had no knowledge of the circumstances leading up to the young man being found.

“A staff member discovered a young man in the hospital car park with serious injuries,” an organisation spokesperson said.

“Despite the immediate efforts of hospital staff and emergency responders to provide assistance, the young man sadly died from his injuries.

“Our thoughts are with the young man’s family and loved ones during this difficult time.”

Opposition Leader Jess Wilson empathised with the victim’s family and mum who had “woken up this morning to the worst possible news of her life”.

“It’s devastating to see the record levels of crime in this state now taking another young life,” Ms Wilson told reporters.

She pledged to put more police on the beat and change laws so people faced consequences for their crimes should the opposition win the November state election.

“Victoria is broken. It is broken its very soul,” Wilson said.

-with AAP