(U-WIRE) IOWA CITY, Iowa-Under increased security following a Tuesday bomb threat, the University of Iowa Dental Science Building will reopen to students, faculty and patients today.

Approximately 30 members of bomb squads from Johnson and Linn counties, Marion Township, the state Fire Marshal’s Office and UI Public Safety conducted an “extreme and thorough” investigation of every locker and office in the building Wednesday, said Ann Rhodes, the vice president for university relations, during a Wednesday press conference.

No explosive devices were found, she said.

“We’re as sure as we can be that there is nothing unusual in the building,” Rhodes said. Future decisions involving building procedures will occur on a day-to-day basis, she said.

This was the UI’s first closure of a building in more than 30 years, during anti-Vietnam War demonstrations. It is the first building closing due to a bomb threat, said Steve Parrott, the UI director of university relations.

The dental building will reopen one door at 6:30 a.m. today with increased security precautions, Rhodes said. Two security guards will patrol the area outside building, while a Public Safety officer will be inside to conduct searches of those entering, she said.

Officials opted not to use a metal detector inside of the building because a machine would likely only detect firearms, which would be found by the searches, Rhodes said.

UI dental student Adam Petty said it will feel awkward to be searched – but after seeing reports on television about the bomb search, he said, he planned to get on with life and attend classes.

“I feel confident they did a through search, and I feel I am ready to go back to the school,” Petty said.

Threats began at the dental school on March 28, when faculty members received an e-mail demanding that the school purge itself of minorities.

Incidents have escalated since then, with two more racist e-mails received by dental faculty and students, a lab coat set on fire, and an incident in which a bowl of spaghetti was left on a dental student’s doorstep with an attached note claiming it represented “dead black man’s brains.”

The group claiming responsibility for the previous incidents identified itself as “minorityrid”; the Tuesday bomb threat e-mail was signed “me jones.”

The messages from minorityrid were sent from an excite.com e-mail address, while the message from “me jones” was from yahoo.com. The account registered for the address on the Yahoo! Web site-bombsquad_52244-identifies the user only as male and was last updated Tuesday.

The excite.com address was registered to an Iowa City male, authorities discovered days after the first e-mails were sent.

“The most troubling thing about this is that it is so inconsistent with what tends to happen here,” Rhodes said.