Three people were killed and six wounded when three fuel tanker trucks exploded in the industrial Musaffah area near storage facilities of oil firm ADNOC, state news agency WAM said. It said those killed were two Indians and a Pakistani. Unverified footage on social media showed a thick plume of black smoke billowing from what appeared to be the Musaffah area. “Initial investigations found parts of a small plane that could possibly be a drone at both sites that could have caused the explosion and the fire,” Abu Dhabi police said in a statement, adding there was no “significant damage”. The Houthi’s military spokesman said the group launched a military operation “deep in the UAE” and would announce details in the coming hours. The move could heighten tensions between the UAE and Iran after outreach to Tehran by Abu Dhabi to avoid any regional conflict that could hurt the OPEC producer’s economic ambitions. The Abu Dhabi stock market index ended 0.1% lower, shaving off early gains after the news of the explosion and fire. The stock market index had gained as much as 0.3% in early trade. The incidents coincided with a visit to the UAE by South Korean President Moon Jae-in. A Blue House official said a planned summit between Moon and Abu Dhabi’s crown prince was cancelled due to an “unforeseen and urgent matter of state”. UAE authorities and ADNOC did not immediately respond to Reuters’ requests for comment. The coalition’s spokesman did not immediately respond. The suspected drone attacks would concern oil market watchers at a time when global powers are trying to salvage a nuclear deal with Iran, said Torbjorn Soltvedt, Principal MENA Analyst at risk intelligence company Verisk Maplecroft. “With negotiators running out of time, the risk of a deterioration in the region’s security climate is rising,” he said. The Yemen war is largely seen in the region as a proxy war between Saudi Arabia and Iran. A senior Emirati official had visited Tehran for talks with Iran’s new president last month in a bid to improve ties. In July 2018, the UAE denied reports that the Houthis attacked Abu Dhabi airport with a drone. A month later, Dubai International Airport said it was operating as normal after Houthi-run media said the group launched a drone attack there.