Goldenson building
© Getty ImagesExplosion took place about 2.48AM • fourth floor • Goldenson Building Longwood Campus
Harvard's medical school was rocked by a huge explosion early Saturday morning.

Law enforcement said the blast appeared to be deliberate and that two people were seen fleeing as they arrived.

The explosion took place at about 2.48am in the fourth floor of the Goldenson building on the Longwood campus.

No injuries were reported.

'Upon arrival at the building, the officer observed two unidentified individuals fleeing the building,' the Harvard University Police Department said.

'The officer attempted to stop the individuals before proceeding to the floor where the alarm had been triggered.'

Boston police checked the building for additional explosives and did not find any.

The FBI was at the scene, according to the Harvard Crimson.

bomb suspect
© APBomb suspect image released to public
suspect
© APSuspect with face cover
The Goldenson Building is part of Harvard's medical school and is located on the prestigious university's main campus.

The university said a Harvard police officer was sent to the building for a 'fire alarm activation.'

Upon arriving, the officer spotted two people fleeing Goldenson.

They attempted to stop the individuals before proceeding to the floor where the alarm had been triggered.

The incident remained under investigation.

As of Saturday afternoon, officials had not provided additional details on the explosion or on whether the suspects had been identified.

Images of two unidentified individuals were captured on CCTV and have been released to the public.

The pair are seen in face coverings and wearing sweatshirts. One suspect has a dark blue hoodie and is wearing jeans.

University police has asked anyone with information about the explosion to contact them.