"We believe that MacInnis acted alone, and there are no additional threats to this community, " Sisson said.
Professor Sisson determined that the steel was attacked by a liquid slag which contained iron, sulphur and oxygen.
Fed up with harassing phone calls, losing sleep and any peace of mind, Sisson called Cranston police a few months ago.
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Sisson, CEO and Chairman of the Board Jerre L. Stead, and Executive Vice President and CFO Richard Walker sold shares in July.
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Sisson said the suspect got out of his car and walked into his college's campus at the New River Valley in Christiansburg around 1:55 p.m.
However, rather than coming from thermite, the metallurgist Professor Sisson thinks the sulphur came from masses of gypsum wallboard that was pulverised and burnt in the fires.
The type of weapon, how it was obtained and how many shots were fired during the incident were not being released due to the ongoing investigation, Sisson said.
He was being held without bond after being charged on two counts of malicious wounding and two counts of use of a firearm during the commission of a felony, Sisson said.
Tracy Sisson owns the Absolute Fun business in Cranston.
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Police Chief Mark Sisson said Friday that authorities were investigating online postings reportedly made by Neil MacInnis before the shooting but that he was unable to confirm whether those postings were legitimate.
Several elements mentioned in the 4chan post paralleled what Sisson told reporters Friday night, including that MacInnis was enrolled at the community college, lives in Christiansburg and attended that city's citizen police academy last year.
Sisson said authorities were still trying to establish a motive and any connection between MacInnis and the victims, who were hospitalized following the shooting in this town of approximately 21, 000, less than 10 miles from Blacksburg, home to Virginia Tech.
"Today has been a very tough day for law enforcement officers involved, it's been a very tough day for victims and their families, it's been a very tough day for the suspect's family, " Sisson said before reading a prepared statement at a Friday night news conference.
Neil Allan MacInnis, of Christiansburg, faces two counts each of malicious wounding and using a firearm in the commission of a felony stemming from the shooting at the satellite campus of New River Community College at New River Valley Mall, Christiansburg Police Chief Mark Sisson said Friday night.
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