The 16-year-old Centaurus High student accused of planting a device similar to a pipe bomb at the Lafayette school on Monday made his first appearance in court today, and will be held without bond at least until a formal filing of charges on May 24.

The teen -- who has not been identified because he is a minor -- was arrested Monday night at his parents' house, where police said further evidence linked him to the explosive device discovered in the school.

The suspect could face charges including two counts of possession of incendiary materials, felony menacing and interfering with an educational institution. He is being held in juvenile detention.

The suspect's family and attorney left the courtroom without speaking to reporters this afternoon.

Boulder County District Attorney Stan Garnett said his office is reviewing the case to see whether the suspect should be charged as an adult and if the charges are appropriate.

The explosive device, which police described as being "very similar to a pipe bomb," was found Monday morning by a teacher inside Centaurus High School, forcing the evacuation of the school and the closure of South Boulder Road for several hours.

Lafayette Cmdr. Gene McCausey said the device had a 9-volt battery and could have hurt those in close proximity had it exploded.

The device was detonated by the Boulder County bomb squad away from the school.