( CNN ) -- After months of bomb threats at the University of Pittsburgh , an anonymous group that calls itself the Threateners has claimed responsibility for the most recent e-mail threats and announced to the school 's student-run newspaper that it will stop sending them . Michael Macagnone , whose term as editor-in-chief of The Pitt News ended Sunday , said the paper received an anonymous e-mail Friday claiming that the bomb threats plaguing the school since February 13 would end if university officials revoked a $ 50,000 reward for anyone who came forward with information that led to an arrest . The paper received a second e-mail Saturday , after university officials revoked the reward , saying there would be no more threats , Macagnone said . The university has received more than 140 threats since February , according to spokesman Robert Hill . The threats have not yielded any explosives , but the majority of them have resulted in evacuations of dorms , libraries and other campus buildings . Hill confirmed that the university had withdrawn the reward but would not comment on why it did so . The author of the anonymous e-mail to The Pitt News said that the Threateners began sending the bomb threats March 30 because the university issued a reward for `` some young kid who 'd pranked the university , '' Macagnone said . The group said it was not responsible for threats before that date and also said it was not affiliated with anyone who had been `` publically identified as suspects . '' Macagnone said he handed the first anonymous e-mail over to police Friday . The paper published a report on the e-mail Saturday , after a 24-hour period without any threats , which the anonymous author promised in the first e-mail . `` We started thinking the e-mail was a little bit more authentic when it accurately predicted that gap , '' Macagnone said . Since the second e-mail promising an end to the threats , no more have been reported through the school 's emergency alert system . Despite the lull , university officials are restricting final exams , scheduled to start this week , to five campus buildings . All of them will be swept for explosives at the beginning of each exam day . According to a letter posted on the university 's website by Senior Vice Chancellor Patricia Beeson , any buildings that receive bomb threats will be checked for explosives but evacuated only if law enforcement officials deem it necessary . `` These arrangements reflect the expert advice we have received from law enforcement professionals , the experience we have gained over the past several weeks , and the special circumstances associated with finals week , '' the letter says . The Justice Department said in a statement April 11 that investigators were making `` significant progress . '' U.S. Attorney David J. Hickton said they were focused on `` potential suspects . '' Investigators have remained mum on any potential leads . An FBI spokesman declined to comment on the investigation , and a Justice Department spokeswoman did not return calls for comment . Katherine Anne McCloskey , 55 , and Seamus Johnston , 22 , of Cambria County , Pennsylvania , had been subpoenaed in connection with the investigation . The pair testified before a grand jury April 17 , according to Johnston . Johnston said FBI officials returned to the couple 's apartment the following day and seized their computers , cell phones and other files . `` I feel very violated , '' said Johnston , who denies any connection to the bomb threats at Pitt . Johnston , who is transgendered , is filing a lawsuit against the university alleging discriminatory treatment after being charged with trespass , indecent exposure and disorderly conduct after using the men 's locker room for a weight-training class during his junior year , he said . He said he has since been expelled . `` I feel that we 're being investigated solely because I have a lawsuit pending against the university , '' Johnston said . The FBI also seized a server from the New York headquarters of Internet service provider May First/People Link on Wednesday , according to a statement from the company . The server was operated by the European Counter Network , a provider that runs an anonymous remailer service , allowing people to send e-mails completely anonymously , according to the statement released by May First/People Link Director Jamie McClelland . McClelland added that the server was seized in accordance with a search warrant issued by the FBI the previous week requesting all of the information , including IP address , in connection to bomb threat e-mail messages relayed through their servers .
University has received 140 bomb threats since February . Anonymous group says it began sending threats March 30 . Group tells student paper that it will stop sending threats . TL;DR A university in the U.S. state of Texas is on alert after receiving a series of threatening phone calls and emails from an anonymous group.