The evidence included segments of missiles launched at Saudi Arabia from Houthi-controlled territory in Yemen.
Haley said the parts bear markings showing that they originate in Iran, and have technical specifications that are specific to Iranian-manufactured weapons.
She said it was proof of blatant violations of UN Security Council resolutions while the international community was looking the other way because of the nuclear deal.
The US will build a coalition to really push back against Iran and what theyre doing, Haley told a news conference.
Pentagon spokeswoman Laura Seal said: The US has long believed that Iran is providing weaponry to proxies and partners and militias throughout the region, and what we have here to show you today is proof.
Saudi Arabia and the UAE had recovered the arms and loaned them to Washington, she added.
The unprecedented presentation by the Pentagon is part of its follow-through on President Donald Trumps new Iran policy, which promises a far harder line toward Tehran.
Katie Wheelbarger, principal deputy assistant secretary of defense for international...