Canberra's coronavirus outbreak has grown to six, with two new cases including the mystery infection of a high school student.
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The 14-year-old attended Gold Creek School in the city's north between Monday and Wednesday while infectious.
It's unclear how they contracted the virus.
A second case confirmed on Friday is linked back to the infection that sparked Canberra's seven-day lockdown.
Authorities still haven't worked out exactly how that man from Gungahlin caught the Delta variant, but it's thought to be connected to Sydney's outbreak.
Staff, students and visitors at Gold Creek School, which has a primary and secondary campus, must get tested and quarantine for 14 days.
People who were at the school's after-hours care centre, early childhood centre or completing construction work at the school over that time are considered secondary contacts.
Staff and families from the nearby Holy Spirit Catholic Primary School are considered casual contacts.
Between 1500 and 2000 are caught up in the school infection.
Cases are expected to increase, but health authorities hope a lockdown until next Thursday will contain community spread.
Overall in the ACT, nearly 4000 people have been identified as either close or casual contacts.
ACT Chief Minister Andrew Barr apologised for lengthy testing queues and said more sites would be set up.
"This has been a challenging period for Canberra, but the response to the lockdown today has been very good," he told reporters.
"It's going to be a quiet weekend in Canberra. Very quiet. We need people to stay at home."
Single people who live alone can have a "bubble buddy" from another household for the duration of the lockdown.
Disaster payments for workers who have lost hours and support for businesses are being provided.
The ACT's first case in 13 months was confirmed on Thursday as a man in his 20s.
Three of his close contacts also tested positive.
As police enforced health orders, a 20-year-old Canberra man was charged with breaching coronavirus restrictions and assaulting police shortly after the lockdown began.
Meanwhile, concerns about NSW's virus leakage are growing, with that state and the ACT effectively shutting their borders to each other.
Premier Gladys Berejiklian is under pressure from her counterparts not to relax restrictions prematurely as NSW records 390 new locally acquired cases nearly two months into its lockdown.
Mr Barr earlier pointed to "mixed messages" coming out of NSW about when and how quickly it would move to relax restrictions.
He said it would be "insane" for the state to relax restrictions completely after reaching a 50 per cent vaccination rate.
People who live in communities bordering the ACT and NSW are allowed to go in and out of Canberra for essential work or to access healthcare.
Mr Barr said the rules were unclear but blamed it on NSW.
"What I'm hearing is that ACT people have a very clear understanding of our rules and that NSW residents coming into the ACT have a very clear understanding of the ACT position, but that NSW could benefit from clarifying things a little."
Ms Berejiklian flagged border rules for parts of NSW close to the ACT could change.
Australian Associated Press
