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US President Donald Trump has ordered the military to prepare for action in Nigeria to tackle Islamist militant groups, accusing the government of failing to protect Christians.

Trump did not say which killings he was referring to, but claims of a genocide against Nigeria's Christians have been circulating in recent weeks and months in some right-wing US circles.

Groups monitoring violence say there is no evidence to suggest that Christians are being killed more than Muslims in Nigeria, which is roughly evenly divided between followers of the two religions.

Police say an explosion inside a building on the Harvard Medical School campus in Boston early Saturday morning appears to have been an intentional act. No injuries have been reported from the explosion.

Investigators have released photos of two suspects they say were involved in the incident.

The Harvard University Police Department said that just before 3 a.m., an officer was dispatched to the Goldenson Building on Longwood Avenue in Boston for a fire alarm activation.

When the officer arrived to investigate, they saw two people running from the building. The officer tried to stop the two people, but was unable to identify them or prevent them from leaving. Police have since released surveillance photos that show two suspects with their faces covered inside the building. The public is being asked to help identify them.