UPDATE: Harristown State High School staff will work with senior students disrupted by two bomb threats made to the campus today.

In a statement to The Chronicle, a spokeswoman said the department was aware of the bomb threat to the school received about 1.15pm.

"The school advised emergency services and followed the department's protocol for responding to bomb threats," the spokeswoman said.

"The school followed its evacuation plans and all staff and students were evacuated to the school's oval.

"The school also posted advice to parents on their Facebook page."

The school grounds were searched and the all-clear was given by police about 2.42pm.

"All staff and students are safe and well," the spokeswoman said.

"The school will work with the Queensland Curriculum and Assessment Authority to ensure students are not adversely impacted by the interruption."

Anyone with information is urged to phone Policelink on 131 444 or visit police.qld.gov.au and submit a 'Suspicious Activity Report'.

3.45PM: Police are investigating after two bomb threats were phoned in to Harristown State High School this afternoon.

Darling Downs Acting Superintendent Stephen Angus said two calls were received minutes apart, triggering the evacuation of staff and students to two school ovals.

"At approximately 1.15pm, an unidentified male caller contacted the school by phone indicating a bomb was at the school," he said.

"A short time later, a second phone call was received again by an unidentified male caller and indicated a bomb at the school was due to go off at 2pm.

"Police have been advised then they attended the school, and the school and staff together with police implemented evacuation procedures."

The school was searched but police did not locate any suspicious device.

Classes returned about 2.45pm.

Acting Supt. Angus said investigations into identifying the caller were ongoing, and warned there were serious penalties for threatening calls.

"Investigations are ongoing in attempt to identify the suspect," Acting Supt. Angus said.

Police at Harristown State High School where an anonymous bomb threat was phoned in this afternoon.
Police at Harristown State High School where an anonymous bomb threat was phoned in this afternoon. Neville Madsen

EARLIER, 1.45PM: AN ANONYMOUS bomb threat to a Toowoomba high school has triggered an evacuation of students and staff.

Police are searching Harristown State High School after the school received an anonymous call this afternoon.

The call was made to authorities about 1.30pm.

Students and staff are being evacuated to the main oval as a precaution after the threat was phoned in.

One Queensland Fire and Emergency Services crew is at the scene as well as Queensland Ambulance paramedics.

A police spokesman said the threat would be investigated but there was nothing to indicate it was a credible threat.

"The school will be searched," the police spokesman said.