Adam Stuart Busby, 64, a native of Dublin, is facing charges in relation to a number of fake bomb threats he sent to the University of Pittsburgh and surrounding media outlets. Busby, described as a “prolific hoaxer,” has already served prison time for other hoaxes.

The Huffington Post reports on Busby’s bogus threats that cost the University of Pittsburgh in excess of $300,000, as well as a monumental loss of time for students, faculty, and staff at the school.

Busby was charged on Wednesday for issuing threats between April 6 and 21 against the University of Pittsburgh. He also emailed bomb threats against federal courthouses in Pittsburgh, Erie, and Johnstown in June of this summer.

Further, Busby has been charged with threatening Attorney David Hickton, who is also based in Pittsburgh and led the investigation that culminated in Busby’s indictment. Hickton appears to be the only link that Busby has to Pittsburgh.

Busby is a founding member of the outlawed Scottish National Liberation Army, which seeks independence for Scotland from the UK. Busby is in custody in Ireland currently. It is unclear at the moment whether or not he’ll be extradited to the US.

In 2010, Busby was sentenced to four years in prison in Ireland after he sent emails saying there were explosives on flights between London’s Heathrow Airport and New York City. He was released earlier this year, and it is believed he sent the Pittsburgh threats before he returned to prison in July.

Busby is now charged with threatening to poison some English water supplies and then-Prime Minister Gordon Brown in 2010. He is additionally charged for calling in some bomb hoaxes to hotels and the media. 

The University of Pittsburgh first began receiving bomb threats in February of this year after some were written in bathroom stalls on campus. While it isn’t believed that Busby was attached to those threats, authorities believe that he may have started emailing his own in order to build off of the momentum.

A total of 52 threats were made against the University, with some sent to local media outlets. All of them are attributed to Busby, however, he is only being charged with 17 of them.

Pittsburgh Chancellor Mark Nordenberg said on Wednesday that in total,160 buildings were threatened, which prompted 136 evacuations.

Using the pseudonym The Threateners, Busby said he would stop the threats should a $50,000 reward for the sender be ceased. He kept to his word when the reward was rescinded without explanation at the time.

For his threats, Busby faces 17 counts of wire fraud, each carrying up to 20 years in prison, 16 counts of sending false information or hoaxes each carrying up to 10 years, and two counts of international extortion, which carry up to two years each.