The US permanent representative to the UN, Nikki Haley, has accused Iran of supplying Yemen's rebel Houthi movement with missiles to attack Saudi Arabia.
She showed reporters the remnants of a ballistic missile that came close to hitting Riyadh's airport last month.
It "might as well have had 'Made in Iran' stickers" on it, she said, adding that Iran was violating UN resolutions.
Iran denies arming the Houthi movement, which has fought a Saudi-led coalition backing Yemen's government since 2015.
Iran said the claims were "irresponsible, provocative and destructive".
But Mrs Haley said several technical details - the absence of stabiliser fins and a series of valves on the side - marked the missile as Iranian-made.
She added that it had the potential to kill hundreds of civilians, and that this highlighted the "undeniable fact that the Iranian regime's behaviour is growing worse".
"We must speak with one voice in exposing the regime for what it is - a threat to the peace and security of the whole world."
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