The U.S. military on Sunday said Iran helped Houthi rebels shoot down a U.S.-operated drone in Yemen.

In a statement, U.S. Central Command spokesman Lt. Col. Earl Brown said the rebels shot down the MQ-9 drone on June 6 and that the altitude at which it was shot down was “an improvement over previous Houthi capability.”

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This increased capability, Brown said, led the military to conclude the rebels were assisted by Iran.

The Pentagon also blamed Iran for trying to shoot down another U.S. drone responding to what the U.S. government has said was an Iranian attack on the oil tanker Kokuka Courageous last Thursday.

President Trump Donald John TrumpSteele Dossier sub-source was subject of FBI counterintelligence probe Pelosi slams Trump executive order on pre-existing conditions: It 'isn't worth the paper it's signed on' Trump 'no longer angry' at Romney because of Supreme Court stance MORE and Secretary of State Mike Pompeo Michael (Mike) Richard PompeoPutin nominated for Nobel Peace Prize The Hill's Morning Report - Sponsored by Facebook - Trump previews SCOTUS nominee as 'totally brilliant' Pompeo accused of stumping for Trump ahead of election MORE have blamed Iran for the tanker attack, an assessment echoed by the British and Saudi governments.

But Germany’s foreign minister has said further evidence is needed and the owner of one of the ships has contradicted the U.S. account.