The US and Britain are calling for a UN investigation of Israel's claim that it intercepted an Iranian shipment of rockets headed for the Gaza Strip.
UN officials have said that if Israel's claims are true, Iran would be in violation of Security Council sanctions.
US deputy ambassador Rosemary DiCarlo urged the Security Council committee that monitors sanctions against Iran to investigate the incident.
She said "the committee should be prepared to impose real consequences, such as possible sanctions designations on those responsible."
British Ambassador Mark Lyall Grant called for a similar investigation.
The envoys spoke yesterday at the Security Council after a briefing on the sanctions committee's latest report.
Iran has accused Israel of staging the Red Sea seizure to derail Tehran's improving relations with the West.
