WASHINGTON (Reuters) - The U.S. cruise missile strike against Syria on Thursday was a "one-off," meaning that it was expected to be a single strike with no current plans for escalation, a U.S. defense official said.

The official, who spoke on condition of anonymity, told Reuters he believed that the strike did not signal a major shift in U.S. President Donald Trump's focus on domestic affairs.

(Reporting By John Walcott; Writing By Arshad Mohammed; Editing by Michael Perry)