Out-of-school kids and adult predators spending more time at home and on the internet during the coronavirus pandemic is the "perfect storm" driving a spike in online child sex abuse around the world, activists and police say.
From slums in the Philippines to Australia's suburbs, the cross-border crime has mushroomed as offenders take advantage of school closures and lockdowns to reach children - either in person or via social media, gaming sites and the dark web.
In Australia, federal police received more than 21,000 reports of child sex abuse in the 12 months to 30 June, an increase of over 7,000 cases on the previous year.
Australian investigators also recorded a 136 per cent increase in online child sex exploitation material.
"Some of those dark web sites are actually crashing because they're not coping with the amount of traffic," Australian Federal Police detective superintendent Paula Hudson said.
She said police "directly attribute" the "incredible influx" to offenders and children spending more time at home because of lockdowns and school closures, with children often left unsupervised as parents juggle work and care responsibilities.
"COVID-19 lockdowns created the perfect storm for increases in online sexual exploitation of children," explained John Tanagho of the International Justice Mission in Manila.
The Philippine government saw a 260 percent increase in reports of online child abuse materials from March to May - when the country was in a strict lockdown, UNICEF said.
Investigators are even "seeing COVID-specific child exploitation forums where (offenders) are discussing the opportunities that have arisen during the COVID period", Det Supt Hudson revealed, including one with 1,000 members.
Online sexual exploitation of children is a "crime of opportunity" driven by demand from sex offenders, said Mr Tanagho.
The abuse is often repeated regularly to create new material.
With jobs and income lost and more time spent at home as a result of strict virus measures, in the Philippines many of the victims are first abused by their own parents, who livestream the sexual violence for predators in wealthy Western nations.
"The sexual abuse is directed, it's paid for and it's consumed live by child sex offenders around the world who don't need to leave the comfort of their home," Mr Tanagho said.
Children are abused for an average of two years before being rescued, he added, but the trauma is long-lasting.
Mellanie Olano, lead social worker with the International Justice Mission in Manila, told AFP: "It is a bit chaotic whenever we enter the house where the abuse is happening, the children are all crying."
Young victims are often on high alert, experience hyperarousal, suffer sleep issues, difficulty concentrating and struggle to control their emotions.
"Of course, because most of the perpetrators are the parents... they are separated from their parents," she added.
In Indonesia - which along with the Philippines has become a global hotspot for child sex abuse - around 20 per cent of children surveyed by ECPAT, an international NGO working to end child exploitation, reported predatory behaviour online.
Police in West Java province recently uncovered a group on popular messaging app that facilitated "live nude shows" including several minors.
Among them was a 14-year-old girl who was convinced to do a strip show while her parents thought she was doing homework online in her room.
The group's membership has tripled to 600 since the pandemic began.
"Parents must be even more careful to monitor their children's online activities because it can take just minutes for them to become a perpetrator or a victim in online crimes," criminal division head Teuku Rasya Khadafi said. "Everything is there on the internet."
Former Australian cop Glen Hulley at anti-trafficking organisation Project Karma said paedophiles are also bypassing parents by using gaming platforms.
"What mostly we found during this lockdown period is that perpetrators are trying to reach the kids in a popular app for kids, such as online gaming platforms with chat features," he said.
Activists have reported adults pretending to be peers, famous YouTubers or even celebrities like Justin Bieber.
"Once the initial interaction started, they asked them to chat in other platforms so that they could be in contact without any disturbance from the game," Mr Hulley said.
It is not only children in developing countries that are being sexually abused.
In recent months, Australian police arrested 15 men accused of producing or sharing child abuse material online and identified 46 alleged victims, including 16 at a single childcare centre.
They ranged from 16 months to 15 years, with an average age of eight years.
Tackling the issue has been further complicated by the pandemic.
Before Australia closed its international borders to stop the spread of the virus, police regularly arrested suspected child abusers as they returned home on flights from Southeast Asia.
But as offenders have moved online in greater numbers, Det Supt Hudson says police have followed them, working more closely across with international counterparts by using virtual tools such as video conferencing.
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"Certainly the COVID pandemic has not hampered anything - if anything it's actually increased our cooperation," she said.
"The more we're investigating and the more we're getting ahead, the more offenders that are revealed," she added.
The alleged Australia-based child sex abuse ring was busted after a tip-off from US authorities, who also arrested three Americans.
A network of suspected offenders was identified across Europe, Asia, Canada and New Zealand, with police making almost 150 referral to their counterparts in those regions.
Mr Tanagho, though, is less optimistic that authorities are making headway.
"This is a massive, massive problem and globally... this is just the tip of the iceberg," he said.
As well as greater law enforcement, Mr Tanagho said tech companies needed to do more to develop tools that could catch livestreamed abuse in action.
"If sex offenders and traffickers fear being detected by the platforms they're using, if they fear being arrested... then they are much less likely to abuse children online," he said.
"The easy money or the sexual gratification is just not worth being caught and sent to prison."