12:24AM: THE BOMB squad has been called to Gladstone State High School and students are being looked after by police after the discovery of a suspicious note late this morning.

The note was handed in to the office by a group of female students who reportedly found it in the school bathrooms shortly after 11AM.

The note contained "unknown threats" and made reference to "possible explosive devices" on the school grounds, according to Sergeant Wayne Butcher.

"It was a disconcerting note and they took it straight to the office," Sgt Butcher told The Observer.

The bomb squad was called to the scene and students were led to the school oval, then later taken to a safe location.

11.51AM: POLICE officers are talking to a large group of students at Gladstone State High School's front gates, by the main entrance on the Dawson Hwy.

A fire truck is also parked at the scene.

A police spokesman said police remained unable to elaborate on the circumstances surrounding the call.

11:36AM: POLICE and firefighters have been called to Gladstone State High School in response to what The Observer understands may be a possible bomb threat.

Toolooa State High School was evacuated in response to a bomb threat on Tuesday.

A police spokeswoman confirmed police were responding to an incident at the school but said no further details were available at this time.

This is a developing story. Updates to follow as details emerge.