Kiama High School was among more than 30 NSW high schools to receive anonymous threatening emails over the last two days.
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Nowra and two schools in the Southern Highlands, Bowral and Moss Vale high schools, were also evacuated on Wednesday after receiving threatening emails.
They were among the more than 10 high schools in regional NSW targeted, after more than 20 high schools across Sydney received an anonymous email on Tuesday, which outlined threats towards the school.
Department of Education secretary Mark Scott said the forced evacuations affected some 800 students doing HSC exams on Tuesday and Wednesday.
On Wednesday detectives from the Cybercrime Squad established Strike Force Rolum to investigate the circumstances and origins of the emails.
Cybercrime Squad Commander Detective Superintendent Matt Craft said it was too early to say who was responsible for sending the threatening emails.
Asked whether the emails could have been sent by disgruntled former students or a more sophisticated syndicate, Supt Craft would not speculate on the motivation.
"I think it is too early to say at this stage. What I am appealing for is information," Supt Craft said.
"We do believe that there is individuals out there, whether they be students, friends or families who have some information."
Supt Craft added the emails themselves were "fairly bland".
"They indicate that there is a device that has been located but there is no demands," he said.
"But once again the emails are concerning, the fact that they have been sent in the first place is extremely disappointing and is criminal behaviour, very serious criminal behaviour."
Mr Scott added some 300 students from just over 10 regional high schools doing their HSC Biology exam were forced to evacuate for a period of time on Wednesday.
"We have had 300 students who were sitting the exam where a threat was received. We are still getting the detailed reports back on the extent of the disruption," he said.
"What we found [Tuesday] was some students had a relatively short disruption and they were able to continue on and complete the exam, for other students that wasn't possible.
"So that's when the misadventure provisions from NESA come into play, that's when they are able to come in and make their own judgement which will be fair to the students concerned..... so 300 students had their exams disrupted today, 500 yesterday."
Mr Scott said the department would continue to follow the advice of police on the ground.
"In every circumstance where a threat is made in the school environment we engage with the police," he said.
"We work closely with them and we follow their guidance and direction on how we best manage those circumstances and we are working closely with the police in how we deal with these circumstances now.
"We have protocols that we put into place when threats are made, and the first element of that protocol is safety of staff and students and engagement with the police.
"We've had a police presence in the schools and it has been the work of the police that has allowed sites to be cleared and declared safe for exams to be able to continue.
"We will continue to work closely with the police in every circumstance."
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