Two men were arrested in connection with an explosion on Harvard University's Longwood Medical Campus, federal officials said Tuesday.

The explosion happened Saturday just before 3 a.m. on the fourth floor of Harvard's Goldenson Building, which is on the university’s medical campus.

Special agents and officers with the FBI Boston's Joint Terrorism Task force and Harvard University Police Department arrested the Massachusetts men, who were not identified.

A news conference is planned for 1 p.m.

There was no structural damage to the building in the aftermath, and all labs and equipment remained fully operational.

"It’s a shame that people do things like that," said Boston police commissioner Michael Cox. "I’m pretty confident we will hold people accountable for that."

University police

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