"The Department of State continues to warn U.S. citizens against travel to Somalia,” Saturday’s bulletin emphasized. "The security situation in Somalia is extremely unstable, and the threat to all U.S. citizens in Somalia remains critical. The Department of State urges all U.S. citizens who decide to remain in Somalia to review your personal security plans, take appropriate steps to enhance your personal safety, remain aware of your surroundings, monitor local media for updates, and maintain a high level of vigilance.

An American-led coalition succeeded to driving the Islamic State from their capital of Raqqa, Syria, in October, but the ensuing weeks have validated warnings that the terror threat wouldn’t end with the destruction of the self-proclaimed caliphate. The Islamic State took credit for an attack in New York City on Tuesday that killed eight people, calling the suspect a "soldier of the caliphate." Four American soldiers operating in Niger were killed in a late October ambush, as well.

"The war is headed to Africa,” Sen. Lindsey Graham, R-S.C., said at the time. "It's beginning to morph. As we suppress the enemy in the Mideast, they are going to move. They are not going to quit.”