Two suspects in the weekend explosion at Harvard Medical School in Boston remain on the run Monday as police declared it safe for students and faculty to return to campus. The explosion happened just after 2:45 a.m. Saturday in the Goldenson Building.

( NewsNation) — Police have released surveillance images of two potential suspects following Saturday morning’s intentional explosion at Harvard Medical School in Boston. According to the Harvard Crimson, the explosion took place at the Goldenson Building in Harvard’s Longwood Medical Campus.

The explosion in a building at Harvard Medical School on Saturday affected a small section of a hallway on one floor and inflicted no structural damage to the building, officials of the school said on Sunday.

Investigators say an explosion inside a Harvard Medical School building over the weekend was intentional. Police are searching for two suspects.