This is the second arrest by the police which took suo motu cognisance of the happenings in the group after screenshots were shared on social media and registered a case. A 15-year-old boy was earlier apprehended after questioning.
Investigators said the group had 22 members in all, and two of them were adults studying in colleges. At least 20 of them are studying in at least four prominent schools in Delhi-NCR, they further said.
On Tuesday, 10 members were questioned over phone.
The devices of the identified members of the group have been seized and sent for forensic analysis.
The cyber crime unit has asked for information about the alleged group and its members from Facebook-owned social networking platform Instagram. Their reply is awaited, an official said.
The role of other members is being ascertained, said investigators.
The content on the group included a remark by one member who suggested collecting a group of boys to gang rape a classmate, and several photos of schoolgirls that were accompanied with texts objectifying them. There were also copies of photos posted by girls on Instagram that were then appended with lewd and violent remarks.
The conversations were exposed after one of the boys in the group took screenshots and passed it on to someone else, said the officer, before it was posted on social media by one of the girls who was targeted.
The police have invoked sections of the Information Technology Act and the Indian Penal Code dealing with the distribution of pornographic content and making objectionable remarks about women.
On Monday, authorities of one of the schools – where the whistleblower student studied – filed a complaint with the Delhi Police. “Once the screenshots emerged in the public domain, the group was deleted and another one created. Some girls were added in the new group to mislead police,” said an investigator.
The original group was created in early April, the investigator quoted above said.