Police have scoured the streets around the school of missing Melbourne teenager Siriyakorn "Bung" Siriboon in a hunt for clues to her disappearance.
The 13-year-old never arrived for school after setting off from her Boronia home on foot on the morning of Thursday, June 2.
The homicide squad has now joined the investigation, seizing her computer to analyse her three Facebook pages.
Detective Senior Sergeant David Snare said the hunt for clues had expanded to the streets after a search of the schoolyard earlier in the week.
Police doorknocked homes around Boronia Heights College on Thursday while a State Emergency Service team combed the area.
"We have the SES at the moment out searching in the vicinity of the school and surrounding streets for evidence that might have been dropped," he told reporters.
"We need to analyse contacts with other students (and) other groups that she's associated with."
Det Sen Sgt Snare said police had received a few unconfirmed sightings of Siriyakorn but little other information from the public.
"I would've thought we might have had more (public information) by now."
Siriyakorn's stepfather, Fred Pattison, said the family did not believe she had been murdered.
"We believe she's still alive, we feel in our hearts she's still with us."