WASHINGTON — In a stepped-up response to Iranian backing of Shiite rebels in Yemen, the Navy aircraft carrier USS Theodore Roosevelt is steaming toward the waters off Yemen to beef up security and join other American ships that are prepared to intercept any Iranian vessels carrying weapons to the Houthi rebels.

The deployment comes after a U.N. Security Council resolution approved last week imposed an arms embargo on the Iranian-backed Shiite Houthi rebels. The resolution passed in a 14-0 vote with Russia abstaining.

Navy officials said Monday that the Roosevelt was moving through the Arabian Sea. A massive ship that carries F/A-18 fighter jets, the Roosevelt is seen as more of a deterrent and show of force in the region.

The Navy has been beefing up its presence in the Gulf of Aden and the southern Arabian Sea in response to reports that a convoy of about eight Iranian ships is heading toward Yemen and possibly carrying arms for the Houthis. Navy officials said there are about nine U.S. warships in the region, including cruisers and destroyers carrying teams that can board and search other vessels.

Saudi Arabia and several of its allies, mainly Gulf Arab countries, have been trying to drive back the rebels, who seized the capital of Sanaa in September and have overrun many other northern provinces with the help of security forces loyal to former President Ali Abdullah Saleh.

Western governments and Sunni Arab countries say the Houthis get their arms from Iran. Tehran and the rebels deny that, although the Islamic Republic has provided political and humanitarian support to the Shiite group.

The U.S. has been providing logistical and intelligence support to the Saudi coalition launching airstrikes against the Houthis.