Brandon D’Alessandro and Harmony Austin, also 15, had been the subjects of a police search after they were reported missing by their families on January 4.
This afternoon ACT Policing revealed Harmony turned up “safe and well” last night, but Brandon remained missing.
“Police and his family still have concerns Brandon as it is believed he is suffering from untreated injuries,” police said in a statement.
Investigators refused to disclose Brandon’s injuries but in a Facebook post on Friday, the boy’s mother Jennie Wright revealed Brandon had been badly hurt in a balcony fall.
“Please help find them … Brandon has internal bleeding and breathing problems from a 2 storey balcony drop,” Ms Wright wrote.
Ms Wright, a mother of eight, asked the public to ignore malicious comments about her son’s behaviour after dozens of people posted unkind comments on the ACT Policing Facebook page.
A Canberra police spokesman told news.com.au investigators had spoken to Harmony about Brandon’s whereabouts and condition.
This afternoon ACT Policing put out a renewed appeal for information about the teen’s whereabouts.
“Police understand Brandon was in (the southern Canberra suburb of) Wanniassa about 9.45pm yesterday,” it said.
Brandon is described as being of caucasian appearance, about 165cm (5’5”) tall with blue eyes and a slim build. He has recently cut light brown hair which is shaved on the sides and long on top.
He was wearing a white, red and black short-sleeved Fila brand shirt and black pants.
“Police and his family still have concerns Brandon as it is believed he is suffering from untreated injuries,” police said in a statement
Anyone who may have any information that could assist police in locating Brandon is urged to contact ACT Policing Operations on 131 444 and quote reference number 6480961.