Pottsville police have arrested Todd Dohner, 48, of Pine Grove for making calls to the Schuylkill County courthouse overnight Thursday, threatening to have terrorists shoot up a school unless the courthouse was closed by noon.

The caller said he was the leader of a "terrorist group" and would have his group shoot students at a school from 100 yards away at 3 p.m. if his demand was not met.

The courthouse was closed at about 11 a.m.

Dohner is charged with two counts of felony terroristic threats, two counts of felony criminal use of a communication facility and two counts of persistent disorderly conduct.

He was video arraigned by on-call District Judge Anthony Kilker, Shenandoah, and jailed in the county prison under $500,000 cash bail.

Pottsville police Chief Richard F. Wojciechowsky said in a prepared statement that Dohner admitted to making the calls.

He said police "gained evidence that specific incoming calls correlating to the times the threat calls had been received had been made from a cellular phone utilizing cell towers in the Pine Grove area."

Further investigation led them to a specific cell phone number, and "independent information" revealed the number was Dohner's.

At about 2:40 p.m., police went to the home of Dohner and his father and took Dohner to the police station.

Police interviewed him about his role in the threatening calls.

"During the course of the interview Dohner admitted to placing the calls using his cellular phone from his home and the phone he used to do so was recovered by police inside his home," Wojciechowsky said.

Police believe Dohner acted alone and is not part of any terrorist organization. There is no ongoing threat to any government buildings or schools, Wojciechowsky said.

Dohner has a criminal history stretching back to 1989. In Feb. 2013, he pleaded guilty to making terroristic threats to cause serious public inconvenience, and harassment involving lewd, threatening language.