Wellington High School was in lockdown earlier this morning after police received a report of a threat in the area.
The school published an update at around 10.15am, saying the "situation had been resolved with police support".
Wellington High School Principal Dominic Killalea said everyone had responded to instructions and all students, staff and persons on-site had been accounted for.
A police spokesperson said two people were being spoken to about the incident, and police would remain in the area as a precaution.
Earlier in the morning police had received "credible information about a threat to the school" over social media.