A police spokesperson said gunshots were heard near the school at 10.20am.
A police presence will be noticed around the school while police try to validate the alleged shooting.
“We do not believe there to be a wider threat to the public in relation to this incident,” the spokesperson said.
Earlier this month, two colleges were evacuated in Botany and Western Springs after threats of bombs and gun violence.
The threats came after a spate of threatening emails were sent to almost 100 schools, churches, hospitals and other public buildings over three weeks late last year.
Schools around the country were closed and evacuated due to those threats. It’s understood police are yet to identify those responsible.
At the time, police said they were confident the emails were from the same source and not targeted at any particular community or group. They did not believe there was any real threat to the organisations.
On November 23 police were confident emails received by a number of organisations were from the same source.
Cybercrime unit staff were working to identify the origin.
Police described it as a complex task to identify who sent the email.
Just before Christmas police said they would no longer be providing information on non-specific mass email threats where there was no apparent risk to public safety.
Police have been approached for comment.