Mahoney would only characterize the fire as "suspicious," and declined further comment.
"The fire is still deemed suspicious, and is still under investigation," HUPD Sergeant James L. McCarthy said.
The Gibbs Lab was accessible through an adjoining construction site, and HUPD said that it was possible that someone might have gained entrance that way.
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"This is really the beginning of the investigation, but we don't believe that it was any outside groups," McCarthy said.
"[The fire is] under investigation, and we'll have to wait to see what the state fire marshal says," John R. Lenger of the Harvard News Office said.