HUNTLEY – A Union man has been charged with disorderly conduct after he made a fake bomb threat at Huntley High School, police said.

About 2 p.m. Saturday, Derek M. Habbley, 25, made threats to his cellular phone service provider that he had a bomb in his back pack, police said. He gave a description of himself and his vehicle, police said.

When officers arrived at the Huntley High School parking lot, they spoke with Habbley who admitted to making the threats, police said.

Habbley was charged with disorderly conduct and taken to McHenry County Jail to await a bond hearing.

The school property was sealed off so police could determine if it was a legitimate threat, police said.

Police had the Kane County Sheriff's Bomb Unit come to the scene to inspect the backpack and vehicle. Dogs, a robot, an x-ray machine and bomb technicians were utilized during the investigation.

The back pack was stuffed with papers, books and pens, but nothing to indicate there was explosive material, said Deputy Chief Mike Klunk.

About a dozen houses had to be evacuated, Klunk said.

A play scheduled for Saturday evening was canceled, Klunk said.

Students who were participating in a swim meet and bowling meet off campus and had their cars parked at the school, were unable to get to their vehicles during the investigation, Klunk said. About 20 to 30 cars were parked at the school.

The scene was cleared about 8:55 p.m.

Police sent out its first NIXLE alert for the incident about 6:40 p.m.

Officers didn't have internet access out at the scene, and wanted to figure out as much as possible before sending out an alert, Klunk said.

Although safety is the number one concern, "we don't want to jump the gun," Klunk said.