Investigations are continuing into a reported trespassing incident that placed a Riverstone school into lockdown.
Police were called to the school about 1.30pm on Friday, November 15 following reports a man had entered the grounds.
"Officers from Quakers Hill Police Area Command attended and spoke to a 25-year-old man," a police statement said. "He was taken to Blacktown Hospital for observation.
"Police established a crime scene and are investigating the circumstances surrounding the incident.
"The school was placed into lockdown but that has since been lifted."
Inquiries into the incident were continuing, police stated.