Three schoolgirls have been arrested in connection with the assault of a 12-year-old girl who was beaten up at a public housing estate in Hong Kong, police said on Monday. The incident happened at Yau Tong Estate in the Kowloon East region at about 7pm on Sunday, when the 12-year-old had a dispute with her three female friends, all aged 15 “The four girls are students and they know each other,” a police source said. “They regularly gathered and played in the area as there was no schooling because of the pandemic.” A video clip of the incident showed the victim being slapped by one of the girls, then being assaulted by another. Four people arrested for selling faulty masks In the video, the victim did not try to defend herself, or try to escape during the attack. About 10 teenage boys were seen gathered nearby in the video. A police spokesman said officers responded after receiving a report of the incident at 6.57pm on Sunday. But the youths had left when police arrived. Officers later located the victim, and the three female friends, at the nearby Lei Yue Mun Estate. In addition to the attack at Yau Tong Estate, the spokesman said the victim was also assaulted near Sam Ka Tsuen Recreation Ground on Sze Shan Street in the area, before the four girls reached Lei Yue Mun Estate. According to police, the 12-year-old girl did not request hospital treatment. Police arrested the three older girls on suspicion of assault occasioning actual bodily harm, an offence that carries a maximum penalty of three years in jail. Teen who groped 11 schoolgirls at shopping centre avoids jail time In January and February, three teenagers – one boy and two girls – were beaten up by street gangs at three different public housing estates in Tuen Mun in three bullying cases. In one of the incidents, a 15-year-old girl was slapped and kicked about 50 times by two teenage girls on the roof of a multistorey car park at On Ting Estate in January. The beating was captured in a disturbing four-minute online video that went viral. Police later arrested the two attackers. An increase in youth crime in Tuen Mun prompted police to mount an eight-day operation, code-named “Stepshadow”, in March. Fifteen students were among 60 people arrested in the operation. Figures show the number of juveniles aged 10 to 15 arrested for crimes rose 22.8 per cent to 1,140 in 2019, up from 928 the year before. Arrests for criminal offences among those aged 16 to 20 jumped even more dramatically, with 3,128 in that age group arrested in 2019, up 69.9 per cent, from 1,841 in 2018. Police said, however, that most of the crimes committed by youths were offences against public order, such as unlawful assemblies and riots.