Two students were arrested on suspicion of attacking a teacher and a student at Sunnymead Middle School in Moreno Valley in an incident that was captured by cellphone video and uploaded to social media last week, authorities said.

A third student is still being sought, the Riverside County Sheriff’s Moreno Valley station said in a Saturday, Oct. 5 Facebook posting.

The case was under investigation since the Wednesday, Oct. 2 incident at the school, where the video shows the teacher trying to place herself between a girl who appears to be focusing on a girl who is seated at a table in the classroom.

The girl the teacher is trying to stop gets around the teacher by stepping up on a table to move past her, then sets into the girl she appeared to be targeting.

Several students are seen grappling in the melee in the final seconds of the video, and it is difficult to tell who is directly involved in the incident. The Southern California News Group is not showing the video or stills from it because it shows minor children.

At least one student was initially identified as an “aggressor.” A 12-year-old girl was injured, but not seriously enough to be hospitalized, deputies said at the time.

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The Sunnymead incident took place less than a month after 13-year-old Diego Stolz was fatally injured in what sheriff’s deputies said was an attack by two other boys outside a building at Landmark Middle School in Moreno Valley on Sept. 16. Diego was declared clinically dead Sept. 24.

Both of the 13-year-old boys have been charged in Juvenile Court with voluntary manslaughter and assault. One has pleaded not guilty to the petition and the second boy will enter his pleas on Oct. 15.