The Integrated Homicide Team called for witnesses to come forward, and Earl Marriott Secondary School, where Bartoli was a student, prepared to bring in school counsellors.
A number of youth took to Twitter following news of Bartoli's death including some who had been with him the night he was killed.
"Wishing we stayed with you for a couple extra hours last night and drove you home," said one tweet.
Neighbour Irene Kraschkowski said to lose someone so young so quickly has had a devastating effect on the community's sense of safety
"You think your children are safe and especially in this park." she said. "We come here all the time, and i've never seen any violence of any kind. I left a cup here one time. And it was left there a week and nobody took it, you know? That's the kind of people in this area, You feel safe.
Group of youths had been drinking
The Integrated Homicide Investigation Team said police believe Bartoli and a friend were assaulted by a group of four to five people around 2:43 a.m. PT Saturday.
IHIT spokeswoman Staff Sgt. Jennifer Pound said police were called to a home in the 15600 block of 18 Avenue, where the two teenage boys, aged 14 and 15, had fled.
Bartoli was rushed to nearby Peace Arch Hospital with critical injuries, but he succumbed to those injuries at 10:20 a.m. PT. Saturday, said Pound. The 14-year-old sustained minor injuries in the attack.
Pound said the group Bartoli was with had been drinking. She said police released Bartoli's name in the hope the group that was with him Friday would come forward and speak with them.
Police have said weapons were involved in the assault, but have released no further information about them.
Map: 15600 block 18 Avenue, Surrey, B.C.