In authorised school buses, drivers and nannies are trained to conduct thorough checks of the bus before locking and leaving it
'Unfortunate'
"It's unfortunate that that happened," US Secretary of State Mike Pompeo told Fox News Channel about the ship's release.
Pompeo said that if Iran was successful in making a profit from the tanker's oil cargo, IRGC elite forces would have "more money, more wealth, more resources to continue their terror campaign.".
A US State Department official said Washington had conveyed its "strong position" to the Greek government, as well as to all ports in the Mediterranean about facilitating the tanker.
Zarif said in Finland: "We are happy this ordeal has ended and I hope this will lead to less escalation."
He also said the US warrant had no legal basis and was politically motivated to "make more escalation."
He also appeared to downplay the possibility of US military action against the Islamic Republic in the interview, saying the US habit of saying: "No option is off the table" in its approach to Iran was a violation of the UN Charter.
Greek authorities had no immediate comment on the situation.
Warnings through official channels
Switzerland represents US interests in Iran, which has no diplomatic relations with the United States.
The Adrian Darya 1, which was reflagged to Iran after being delisted by Panama on May 29, was fully laden and carrying about 2 million barrels of oil, Refinitiv data showed. The cargo was valued at tens of millions of dollars.
US President Donald Trump pulled out of a 2015 nuclear deal with Iran in May last year, while the European Union is still part of the accord, which allows Tehran to sell its oil.
While EU regulations still allow for companies and citizens in the bloc to trade with Iran, falling foul of US sanctions has meant most banks are unwilling to process even authorised transactions such as for food and medicine, finance sources say.
Zarif said that because of US.sanctions, Iran could not disclose where the oil would go.
The Greek coastguard said it had no formal information the vessel was heading to Kalamata and was monitoring the matter.
Tanker held by Iran
Separately, a senior Iranian lawmaker said a crisis in Iran's ties with Britain, which included Tehran's seizure of a British-flagged tanker last month, would not be over until the tanker reached its destination.
Iran's Revolutionary Guards on July 19 seized the Stena Impero in the Strait of Hormuz waterway for alleged marine violations, two weeks after the Grace 1 was commandeered.
"Until the Iranian oil tanker arrives at its destination the British must help end the crisis," Heshmatollah Falahatpisheh, of parliament's national security and foreign affairs committee, was quoted as saying by semi-official ISNA news agency.
"The crisis with Britain is not over. Britain has the primary responsibility for ending the oil tanker crisis," Falahatpisheh said.
Mousavi said Tehran was waiting for a court decision on alleged maritime violations by the Stena Impero and he hoped the procedures would be completed as soon as possible.
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