The Pentagon said on Tuesday the presence of a large convoy of Iranian cargo ships in the Arabian Sea was one factor in the U.S. decision to deploy additional warships in the waters off war-torn Yemen but was not the primary reason for the move.

Army Col. Steve Warren, a Pentagon spokesman, also said he did not believe Navy warships patrolling the region had been in direct contact with the Iranian flotilla of nine cargo ships.

Warren dismissed reports the carrier USS Theodore Roosevelt and cruiser USS Normandy had been deployed to the region to intercept Iranian ships carrying arms to Iranian-backed Houthi rebels fighting forces loyal to the U.S.-backed Yemeni president.