DUBAI, United Arab Emirates (AP) -- Yemen's Houthi rebels shot down two American MQ-9 Reaper drones in under a week, the United States military acknowledged Wednesday, further highlighting the regional spread of the Israel-Hamas war.

As the one-year anniversary of the war approaches, Houthis continue a campaign to target ships traveling through the Red Sea as U.S.-led airstrikes pound their positions in Yemen. That's imperiled a waterway that typically sees $1 trillion of trade pass through it, as well as crucial shipments of aid to war-torn Sudan and Yemen.

The U.S. military said Houthis shot down the first Reaper on Sept. 10, and the second on Monday. Online video showed the downing and the flaming wreckage on the ground afterward in Yemen's Dhamar province.

General Atomics Reapers, which cost around $30 million apiece, can fly at altitudes up to 50,000 feet (15,240 meters) and have an endurance of up to 24 hours before needing to land. The aircraft have been flown by both the U.S. military and the CIA over Yemen for years.

U.S. Air Force Maj. Gen. Pat Ryder, the Pentagon's press secretary, said authorities continue to investigate Monday's downing, but declined to elaborate. He added that a claim by the Houthis that they shot down 10 Reapers since the start of their campaign in November over the Israel-Hamas war was "not accurate."

"For operation security reasons, I'm not going to be able to provide a specific number," Ryder said Tuesday.

Since Houthis seized the country's north and its capital of Sanaa in 2014, the U.S. military has seen Reapers shot down in Yemen in 2017, 2019, 2023 and 2024.

Houthis have targeted more than 80 merchant vessels with missiles and drones since the war in Gaza started in October. They seized one vessel and sank two in the campaign that has also killed four sailors. Other missiles and drones have either been intercepted by a U.S.-led coalition in the Red Sea or failed to reach their targets, which have included Western military vessels as well.

The rebels maintain that they target ships linked to Israel, the U.S. or the United Kingdom to force an end to Israel's campaign against Hamas in Gaza. However, many of the ships attacked have little or no connection to the conflict, including some bound for Iran.

Those attacks include a barrage that struck the Greek-flagged oil tanker Sounion in the Red Sea. Salvagers have towed away the burning oil tanker, hoping to avoid a catastrophic leak of its 1 million barrels of oil on board.