(NewsNation) — The FBI has arrested two men in connection with a weekend explosion at Harvard Medical School, the agency said on X.

No other details were provided but officials are expected to hold a news conference at 1 p.m. ET with more information.

No one was hurt in Saturday's explosion, which happened on the fourth floor of a Harvard Medical School building.

Images of two suspects were released by investigators in hopes of identifying the perpetrators.

No motive for the explosion has been determined.

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