Defense Secretary Lloyd J. Austin III on Friday ordered additional combat aircraft and missile-shooting warships to the Middle East in response to threats from Iran and its proxies in Gaza, Lebanon and Yemen to attack Israel in the coming days to avenge the death of Ismail Haniyeh, the Pentagon said.

The military will send one additional squadron of Air Force F-22 fighter jets, an unspecified number of additional Navy cruisers and destroyers capable of intercepting ballistic missiles, and, if needed, more land-based ballistic-missile defense systems.

To maintain the presence of an aircraft carrier and its accompanying warships in the region, Mr. Austin also directed the aircraft carrier Abraham Lincoln, now in the eastern Pacific, to relieve the aircraft carrier Theodore Roosevelt in the next couple of weeks when it is scheduled to return home.

Some ships already in the western Mediterranean Sea will move east, closer to the coast of Israel to provide more security, a senior Pentagon official said.

“Secretary Austin has ordered adjustments to U.S. military posture designed to improve U.S. force protection, to increase support for the defense of Israel and to ensure the United States is prepared to respond to various contingencies,” Sabrina Singh, the deputy Pentagon press secretary, said in a statement.

The statement did not specify when the additional warplanes and combatant vessels would arrive, but officials said on Friday it would be a matter of days for the additional aircraft and somewhat longer for the naval reinforcements.