Spring Valley high school students returned to class this morning after a violent fight ended the school week on Friday.

 Parents say three students were hurt in a fight Friday afternoon and the brawl in the school's parking lot could have easily turned deadly.

Cellphone video captured the chaos that ended with two students suffering knife wounds, a third punched in the face and another taken into police custody.

The injured students are expected to recover. But worried parents are still saying enough is enough.

Parents shared their concerns at a recent East Ramapo School Board meeting. They said the violent incident at the school was inevitable unless additional security had been present.

For now, the students are returning for placement testing.

School officials are calling this an isolated incident. "We also have a zero-tolerance policy regarding violence in any form or fashion in our building or on our campuses," says Superintendent of Schools Dr. Clarence Ellis.

But some parents say they have been asking for more security in the schools due to concerns over possible violent incidents. School officials tell News 12 they are now adding more security in school going forward.

Police do not expect that any violence will continue beyond Friday's incident.

The investigation into the incident continues. Anyone with any information is asked to call the Spring Valley Police Department.