High school is plunged into lockdown as boy suffers 'injuries to his lips' 

A western Sydney school has been locked down after a student from another allegedly came onto the grounds and attacked a teenager.

Hills Sports High School in Seven Hills is now a crime scene after a 17-year-old boy allegedly attacked a student at the school just before 11am on Wednesday morning.

NSW Police confirmed to Daily Mail Australia the teenager has been arrested and is currently assisting officers with their investigations.

Another 17-year-old, who attends the school, is currently being treated by NSW Ambulance paramedics.

More to come. 

Hills Sports High School in Seven Hills is now a crime scene after a 17-year-old boy allegedly attacked a student at the school just before 11am on Wednesday morning