A video appeared showing that a sister of a Syrian refugee was attacked in the same school as her brother was attacked.
The online distribution of film materials shows that a 15-year-old boy is raised at the Almandbury Community School in Huddersfield, West Yorkshire.
16 year old has to pay for the attack.
An additional video about a single incident may indicate that the boy's sister is being attacked by other students.
The video shows that the girl is pulled from the back and then pushed to the edge of the grass.
At the end of the clip, she can see falling to the ground.
The West Yorkshire police announced in a statement: "We have been notified of a video showing a girl attacked by the Almondsbury Community School.
"This incident was not previously reported to the police, but we are now working with the girl's family, which continues to support."
The first video showing that the guy was being landed before water was thrown into his face was tagged at a lunch break on October 25, said the Yorkshire police.
His father, who can not be named for legal reasons, told the BBC that the attack had left his son "very tired psychologically."
"Because of what happened in the video, my son is ruined," he said.
"He does not focus on his studies. When he lies, he wakes up saying that they want me to blow."
In an interview with ITV News, the boy said he was "feeling that I could not study or do homework."
Trevor Bowen, a letter to parents, said: "The safety and well-being of students is our first priority, and I can assure you that this situation is being taken very seriously."
So far, the 15-year-old boy and his family have created an online fund raising page, which helped to get more than 100 000 lats.