DUBAI, United Arab Emirates—An Israeli-owned cargo ship that suffered a mysterious explosion in the Gulf of Oman came to Dubai’s port for repairs Sunday, days after the blast that revived security concerns in Mideast waterways amid heightened tensions with Iran. Associated Press journalists saw the hulking Israeli-owned MV Helios Ray sitting at dry dock facilities at Dubai’s Port Rashid. Although the crew was unharmed in the blast, the vessel sustained two holes on its port side and two on its starboard side just above the waterline, according to American defense officials. It remains unclear what caused the blast, but the incident comes amid sharply rising tension between the United States and Iran over its unraveling 2015 nuclear deal. Iran has sought to pressure President Joe Biden’s administration to grant the sanctions relief it received under the accord with world powers that former President Donald Trump abandoned. From the shore, AP journalists …