A drone strike caused a fire at a nuclear power plant in the United Arab Emirates, officials there said overnight, as United States President Donald Trump said Iran must act "fast" after efforts to end the US-Israeli war with Iran appeared to have stalled.Emirati officials said they were investigating the source of the strike and that the UAE had the full right to respond to such "terrorist attacks".The UAE defence ministry said two other drones had been "successfully" dealt with, and that the drones had been launched from the "western border" Radiological safety levels were unaffected, and there were no injuries, it said.The International Atomic Energy Agency said emergency diesel generators were providing power to the plant's "unit 3", and called for "maximum military restraint" near any nuclear power plant, adding that it was following the situation closely.During the war that began with US and Israeli strikes against Iran on 28 February, Iran has repeatedly targeted the UAE and other Gulf states that host US military bases.Iran stepped up such attacks on the UAE earlier this month after Trump announced a naval mission to try to open the Strait of Hormuz, which Trump retreated from after 48 hours.More than five weeks after a tenuous ceasefire in the conflict took effect, US and Iranian demands remain far apart despite diplomatic efforts to end the war and reopen the strait, the world's most important shipping route for oil and gas.The US has called for Iran to dismantle its nuclear program and lift its hold on the Strait