brbr On a subway in eastern Philadelphia, USA, four black girls were caught verbally abusing and assaulting three br Asian boys and one female student.The video taken by a witness at the time of brr is spreading through Twitter.Philadelphia Mayor brbr Jim Kenny said he was shocked by the incident and said he would identify all the students and hold them accountable.Br perpetrators have been charged with aggravated assault and racial threats, and br1 are also accused of theft for attempting to steal AirPods.Brbr police investigation revealed that they used racist swear words.br In particular, as the perpetrators are identified as 13 to 16 years old, there are concerns about hate crimes that can occur among teenagers.