Police are searching cellphones for video footage of a fight which claimed a 15-year-old boy's life.
Kelston Boys High student Stephen Dudley died in hospital after what was believed to be a pre-arranged fight following his junior rugby team training on Thursday night.
Two boys, aged 15 and 17, have been charged with assault.
Detective Inspector Bruce Scott said police would wait until they had reviewed cellphone footage of the fight before deciding on any further charges.
He said police had received more than 10 cellphones from witnesses to the fight.
"We're waiting for our forensic people to be able to download all the phones that were given to them.''
Mr Scott said police were interested in both still pictures and video of the fight.
"Whatever might be there, we're looking for. Several people have indicated that there were others who were videoing, but haven't named anybody, so that's why we've taken the phones.''
Mr Scott said witness reports had been consistent so far, and video footage should confirm their stories.
Police have spoken to about 30 witnesses.
"We've spoken to everybody that we think we need to speak to at this stage.''
Police were also awaiting toxicology and post-mortem results.
Stephen's funeral will be held tomorrow at Kelston Intermediate, where his father Brent Dudley is a caretaker.