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Four ships, including two Saudi oil tankers, were damaged in mysterious "sabotage attacks" that have inflamed Gulf tensions amid a standoff between the United States and Iran. In the face of growing international concern, US Secretary of State Mike Pompeo scrapped a planned visit to Moscow and headed to Brussels instead for talks Monday with European officials, as Britain warned of the danger of conflict erupting "by accident" in the Gulf. Turning up the pressure on Tehran after the United States deployed B-52 bombers and an assault ship to bolster an aircraft carrier in the region, President Donald Trump warned that Iran would "suffer greatly" were it to "do anything" to threaten US interests. "If they do anything, it would be a very bad mistake," Trump warned at the White House. "If they do anything they will suffer greatly." Acting Pentagon chief Patrick Shanahan proposed a revamped military plan at a meeting with senior national security aides that would send up to 120,000 US troops to the Middle East were Iran to attack American forces or speed up nuclear weapons development, The New York Times reported. Other options have been floated, and this one includes the highest number of troops. Tehran meanwhile called for an investigation into Sunday's "alarming" attacks off the Emirati coast and warned of "adventurism" by foreign players to disrupt maritime security. A UAE government official said the Saudi oil tankers Al-Marzoqah and Amjad were attacked off the emirate of Fujairah along with the Norwegian tanker Andrea Victory and an Emirati ship, the A. Michel. Saudi Arabia, the Islamic republic's regional arch-rival, condemned "acts of sabotage" and a "criminal act", a foreign ministry official said. Neither Saudi Arabia nor the UAE gave details on the nature of the attacks or accused anyone of responsibility. - 'Exercise restraint' - No link has officially been drawn between the incidents and US accusations that Tehran was planning "imminent" attacks against US interests in the region. Asked whether the United States believed Iran played a role, Brian Hook, the US special envoy for Iran, declined to comment, saying only that US authorities would be assisting the investigation at the request of the UAE which has called the incidents "deliberate sabotage." Describing Pompeo's talks with his European counterparts, Hook said they had discussed "what seemed to be attacks on commercial vessels." Underscoring the international concern, German Foreign Minister Heiko Maas said he used his one-on-one with Pompeo to stress that "we are concerned about the development and the tensions in the region, that we do not want there to be a military escalation". British foreign minister Jeremy Hunt called for "a period of calm". "We are very worried about the risk of a conflict happening by accident with an escalation that is unintended on either side but ends with some kind of conflict," he said as he arrived for a meeting of EU foreign ministers in Brussels. And in New York, the United Nations called on all sides to "exercise restraint for the sake of regional peace." Saudi Energy Minister Khalid al-Falih said the kingdom's two tankers suffered "significant damage" but there were no casualties or any oil spill. The Andrea Victory's managers, Thome Group, said the tanker had a hole in the hull area "after being struck by an unknown object on the waterline". The crew were unharmed and the ship was in no danger of sinking, it said. Fujairah port is the only Emirati terminal located on the Arabian Sea coast, bypassing the Strait of Hormuz, through which most Gulf oil exports pass. Iran has repeatedly threatened to close the strait in case of a military confrontation with the United States. "If, and it's an 'IF', there really has been a deliberate attempt to damage these oil tankers, then it's possibly a warning from Iran about the consequences of anybody taking military action against Iranian targets anywhere in the region," said Middle East analyst Neil Partrick. Oil prices rose on world markets on Monday but stocks fell. The spike in tensions came after Tehran said Wednesday it had stopped respecting limits on its nuclear activities agreed under a 2015 deal that has since been abandoned by Washington. - Iran sees plots - Iranian foreign ministry spokesman Abbas Mousavi called the incidents "alarming and regrettable". He "warned against plots by ill-wishers to disrupt regional security" and "called for the vigilance of regional states in the face of any adventurism by foreign elements", a statement said. Almost all the oil exports of Saudi Arabia, Iraq, UAE, Kuwait, Qatar and Iran itself, at least 15 million barrels per day, are shipped through the Strait of Hormuz. Karen Young, a resident scholar at the Washington-based American Enterprise Institute think tank, said the incidents were "clearly... more than a one off attack, but something more coordinated." "Tensions are high and have been escalated by the US as well. We have to be wary of tit for tat provocations, and those that may be misinterpreted or even false flag actions," she told AFP. The six-nation Gulf Cooperation Council -- which includes Saudi Arabia and the UAE -- condemned the incident while Arab League chief Ahmed Aboul Gheit denounced "criminal acts". Shiite-majority Iran rivals Sunni-ruled Saudi Arabia for influence in the Middle East, with the two taking opposing sides in multiple regional conflicts including in Yemen.