ORLANDO, Fla. — A Florida high-school chemistry teacher was arrested this week after students told authorities he taught his class how to make explosives, the Orange County Sheriff's Office said.

David Pieski, 42, a teacher at Freedom High School for two years, used an overhead projector in his classroom to give students detailed instructions in bomb-making, including advising them to use an electric detonator to stay clear from the blast, according to an arrest report Monday.

Authorities who searched Pieski's classroom said they found information, including the chemical breakdown, for an explosive predominately used by Middle Eastern suicide bombers.

One student said he set off an explosive device at a local golf course Jan. 6 and videotaped it, according to Pieski's arrest warrant. The videotape shows a fiery explosion, and the voice of a young man shouting an expletive can be heard.

"[The student] said Pieski approved of the explosion and stated 'cool' when he observed it," the arrest warrant said.

The Sheriff's Office was called to the golf course after residents heard the explosion and saw a fireball on the fifth hole. Investigators found a charred coffee can perched on two concrete blocks and a small piece of burnt wick.

Authorities were called a month later to a home in a subdivision near the golf course because of a report of an acid bomb. Investigators talked to two juveniles on the scene; one mother said her son told her he had been working on a chemistry project for school.

A youth told investigators that Pieski showed students in class how to make the explosive device, the arrest report said.

School district Superintendent Judy Cunningham said Pieski was reassigned late last week to a desk job in her office after he was interviewed by the Sheriff's Office.

He is the focus of an internal investigation, Cunningham said. He is being paid.

He was arrested at Cunningham's office on a charge of possession or discharging of a destructive device and culpable negligence and was released on $1,000 bond. He declined to comment.