Washington on Thursday barred American civilian flights from the area where Iran shot down a US military drone The US Federal Aviation Administration warned of danger to flights "demonstrated by the Iranian surface-to-air missile shoot-down of a US unmanned aircraft system," and barred American civilian aircraft from the area where it took place "until further notice." The Pentagon denounced the "unprovoked attack," claiming the navy drone was 34 kilometers (21 miles) from Iran when destroyed by a surface-to-air missile. But the Islamic Revolutionary Guard Corps said it brought the drone down as it was "violating Iranian air space" over the waters of Hormozgan province. Zarif provided coordinates to back the claim. "At 00:14 US drone took off from UAE in stealth mode & violated Iranian airspace," Zarif tweeted. "It was targeted at 04:05 at the coordinates (25°59'43"N 57°02'25"E) near Kouh-e Mobarak." "We've retrieved sections of the US military drone in OUR territorial waters where it was shot down." But the Pentagon published a map showing the flight path of the drone, which indicated it traveled outside of Iranian waters and included a photograph showing it was at the coordinates (25°57'42"N 56°50'22"E) when it was downed. In a letter to the UN Security Council and UN Secretary-General Antonio Guterres, Iran protested against a "dangerous and provocative act by the US military forces against the territorial integrity of the Islamic Republic of Iran." The drone downing came as Iran was already accused by Washington of carrying out attacks on tanker ships in the congested Hormuz area. Tehran denies involvement but has frequently threatened to block the sea lanes used to ship much of the world's oil exports. The commander of the US Naval Forces Central Command, Sean Kido, said a mine allegedly used in one of the attacks matched Iranian weaponry and that incriminating fingerprints had also been collected. Trump has repeatedly said he does not favor war with Iran unless it is to stop the country getting a nuclear weapon — something Iranian leaders insist they are not pursuing. But Trump critics say his policy of "maximum pressure" — including crippling economic sanctions, abandonment of an international deal to regulate Iran's nuclear activities, and deployment of extra troops to the region — make war ever more likely. A key Republican ally of Trump, Senator Lindsey Graham, said the president's "options are running out." Asked if he believed the countries were nearing conflict, he replied: "I think anybody would believe that we're one step closer." "They shot down an American asset well within international waters trying to assess the situation. What are you supposed to do?" One of Trump's biggest opponents, the Democratic speaker of the House of Representatives, Nancy Pelosi, warned that "there's no appetite for wanting to go to war in our country." Russian President Vladimir Putin, who has close relations with Iran's leadership, said US military retaliation "would be a disaster for the region." Trump's arrival in the White House, alongside veteran Mideast hawks like national security adviser John Bolton, has seen sharp deterioration in relations with Tehran. Trump last year pulled out of the 2015 international agreement on bringing Iran in from the diplomatic cold in exchange for verified controls on its nuclear industry. The move prompted Iran to threaten it will stop observing restrictions agreed to under the deal on enrichment of uranium. bur-wd/ecl By Sebastian SMITH with Marc JOURDIER in Tehran