(CNN) The Attorney General and FBI's deputy director on Monday will announce the findings of the criminal investigation of the December 6 shooting at the Pensacola Naval Air Station that left three US service members dead.

The Florida shooting was carried out by a Saudi national, Second Lt. Mohammed Alshamrani , who was in the United States taking part in a military fighter training program. He was killed in the incident.

As CNN first reported Saturday, the Justice Department is expected to conclude that the Pensacola shooting was in fact an act of terrorism, according to a US official.

No co-conspirators have been charged as part of the investigation, and the Saudi government has pledged its full support.

More than a dozen Saudi servicemen training at US military installations will be expelled from the US after a review that followed the shooting, multiple sources told CNN.

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