WASHINGTON (Reuters) - U.S. Defense Secretary James Mattis met with Saudi Deputy Crown Prince Mohammed bin Salman on Thursday and they discussed U.S.-Saudi military cooperation in the fight against Islamic State, the Pentagon said in a statement.

Mattis and Prince Mohammed, who is the kingdom's defense minister, also discussed "confronting Iran's destabilizing regional activities," the statement said.

(Reporting by Eric Beech; Editing by Eric Walsh)