A United Nations panel has concluded that Iran violated an arms embargo imposed on Yemen by failing to prevent the Houthi rebels in that war-ravaged nation from obtaining Iranian missiles, including one fired hundreds of miles into Saudi Arabia two months ago.

The findings, in a report given to the United Nations Security Council this week, could add weight to American and Saudi efforts to ostracize Iran with accusations that the Iranians are engaged in destabilizing behavior in the Middle East.

The findings, which have not been made public, were first reported on Friday by Agence France-Presse and confirmed by Security Council diplomats who had seen copies of the report.

Remnants of a missile fired from Yemen crashed near the airport outside Riyadh, the Saudi capital, on Nov. 4. It caused no casualties and only minor damage, but Saudi Arabia concluded from the debris that Iran, its regional rival, had been responsible and called it an “act of war.” Iran denied responsibility but sympathized with the Houthis, describing the missile firing as an understandable act of retaliation for Saudi bombardments.