Bottles containing an explosive mix of chemicals ? known as ?pressure bombs? ? have been found at CedarBridge and elsewhere in Bermuda.

Police yesterday warned the devices could burn or blind people.

It is believed students may have learned about mixing chemicals from classes.

Sgt. Steve Cosham, of the Police explosives team, spoke to the media yesterday after suspected incendiary devices were found at CedarBridge Academy.

He said the mix of chemicals build up pressure within a sealed bottle and can explode within a minute.

The chemicals were common household items, but Sgt. Cosham would not identify them through fear of copycat crimes Information about the items were widely disseminated on the Internet.

Sgt. Cosham said there had been several incidents of these pressure bombs in the community. On Tuesday The Ministry of Education said a bottle containing material believed to be incendiary was found at CedarBridge last week.

A student had been recommended for expulsion. The Ministry also revealed that a security officer had located another bottle filled with an unidentified substance this week. Sgt. Cosham believed the incidents could have stemmed from classes where students learned about mixing chemicals.

?I think it?s part of natural learning. They are learning it in class and they decided to take it a step further,? he said. Asked if he thought the students had acted criminally he said: ?I think they acted without reasoning, they did not think it through. These chemicals could blind people. We are very lucky that no one has been injured.?

He added such incidents cropped up occasionally and it was important for the community to educate students about the repercussions of their actions.

?The schools are telling students what not to do and we are pursing an investigation to find out who is involved.?

Acting Inspector Michelle Simons, supervisor of the School Resource Officers, said that officers were visiting schools. She added officers were regularly in the schools, trying to build a good rapport with students. Their aim, she said, was to ensure that students could learn in a safe and secure environment.