A county sheriff in Mississippi says the FBI has arrested one of his deputies and made other arrests across multiple law enforcement agencies in the state

The FBI's Boston Field Office arrested two Massachusetts men in connection with an explosion at Harvard Medical School on Saturday morning.

There are no “hard and fast rules” about what cases merit the agency’s involvement, a former U.S. attorney said.

Romero and her daughter, both U.S. citizens, were among about 400 people detained for hours at a privately owned race track about an hour west of Boise as part an FBI-led investigation into illegal gambling that resulted in more than 100 arrests, nearly all for immigration violations.

Federal officials say two men facing terrorism-related charges scoured LGBTQ+ establishments in Ferndale for possible attacks.

The Federal Bureau of Investigation is assisting Boston and Harvard authorities in the investigation of an 'intentional' explosion at the university.

The FBI and Margate Police are searching for an “at-risk” 10-year-old girl who went missing, officials said Monday.

Federal law enforcement officials are looking for a missing nine-year-old girl who they believe may have traveled through Primm.

Two men have been arrested in connection with Saturday's explosion at Harvard Medical School, the FBI announced on Tuesday.

Buenos Aires was arrested over the weekend by Argentina's Federal Police after the FBI alerted authorities to his social media posts