LOS ANGELES (CBS) — Five people were hurt on Friday after a student attacked a classmate at a South Gate high school.

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A male student came to South East High School armed with a knife and stabbed a female classmate during a lunchtime argument at approximately 11:05 a.m., Los Angeles Unified School District Superintendent John Deasy said.

A female dean and another male student intervened and were also stabbed by the suspect. A campus police officer was also injured in the back, Deasy said.

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The female student was transported to a local hospital in stable condition. The campus police officer was also treated, officials said.

Students say the female victim is the suspect’s ex-girlfriend.

The suspect — whom LAUSD officials confirmed as a student at the school — is now in custody with minor injuries, according to officials.

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The school was placed an a precautionary lockdown to secure the crime scene until shortly before 1 p.m., officials said.