The threat came as the Israeli prime minister, Binyamin Netanyahu, dismissed a UN proposal for an international commission to investigate last week's commando assault on aid ships, in which nine people died. Another aid ship, the Rachel Corrie, carrying Irish and other peace activists, was boarded peacefully by Israeli forces on Saturday, escorted to the port of Ashdod, and its passengers deported.
Netanyahu has defended Israel's right to maintain the blockade by arguing that without it Gaza would become an "Iranian port" and Hamas missiles would strike Tel Aviv and Jerusalem. Israel's undeclared aim is to weaken or bring down the Hamas government.
Mottaki also called for a UN resolution condemning Israel. The security council is discussing imposing new sanctions on Iran because of its failure to meet international demands over its nuclear programme.
Iran and Israel have had no diplomatic relations since the 1979 revolution and President Mahmoud Ahmadinejad regularly predicts the disappearance of the Jewish state as well as denying the Holocaust.
Shirazi said Iran should encourage international efforts to break the blockade. "We should expose our enemies to spontaneous global action and not let them achieve their heinous goals," he was quoted as saying by the semi-official Mehr news agency.
Iran's Revolutionary Guards, which have a command structure separate from the regular armed forces, are fiercely loyal to the supreme leader. Khamenei has attacked the raid as a "mistake" that "showed how barbaric the Zionists are".
Israel's determination to strike at links between Iran and Hamas was dramatically demonstrated in January when presumed Mossad agents in Dubai assassinated Mahmoud al-Mabhouh, who was described as the Hamas official in charge of smuggling Iranian weapons into Gaza.
Israel's no-compromise attitude to aid convoys could be tested again after two Lebanese organisations pledged to send boats to Gaza in the next few days. Reporters Without Borders is attempting to assemble 25 European activists and 50 journalists for a boat leaving Beirut. The Free Palestine Movement is planning a similar attempt.
George Galloway, the founder of Viva Palestina, announced in London that two simultaneous convoys "one by land via Egypt and the other by sea" would set out in September to break the Gaza blockade. The sea convoy of up to 60 ships will travel around the Mediterranean gathering ships, cargo and volunteers.
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A Senior Defense Department official confirms to CBS News that U.S. Naval forces have begun accompanying American-flagged maritime traffic in the Strait of Hormuz.
Iranian naval patrol boats also surrounded a U.S. cargo vessel in the Strait Friday.
"We've taken this step to prevent harassment or possible interdiction by Iranian Revolutionary Guard naval forces," the official told CBS News.
The Navy makes a distinction between accompanying ships and escorting them. The officials said the Navy won't escort these ships but will let them know in advance that they will monitor the situation as they transit the narrow Strait from the Gulf toward the Arabian Sea.
There is no end date for this operation.
The official told CBS News that there are currently five U.S. patrol craft, four destroyers, one aircraft carrier--the USS Theofore Roosevelt, one cruiser and a minesweeper in the Arabian Gulf.
"The overall point is we currently have sufficient naval forces in the region to meet the requirement of the accompanying missions," the official said.
Maersk Line, the Danish shipper that chartered the Maersk Tigris, said the reason for stopping MV Maersk Tigris could be related to a 2005 cargo case.
Maersk Line spokesman Michael Storgaard says they "learned" Thursday that an Iranian appeals court had ruled the company must pay .6 million for a 10-container cargo delivered a decade ago on behalf of an Iranian company in Dubai, United Arab Emirates. However, the cargo never was collected, according to Storgaard, adding it eventually was disposed of by local authorities.
Storgaard said Copenhagen-based Maersk Line will "do everything we can to resolve this matter" with Iranian authorities.
He added the ship and crew aren't theirs. MV Maersk Tigris, operated by Rickmers Ship Management in Singapore, was boarded on Tuesday.