President Trump’s mysterious reference to a frightening security episode in Sweden prompted a deluge of online ridicule — and an official request for an explanation Sunday from a Nordic country that prides itself on tranquility.
At a rally on Saturday in Florida, making a case for measures like his controversial travel ban, Trump alluded to mass-fatality terrorist attacks in recent months in European cities such as Paris, Brussels and Nice.
“You look at what’s happening last night in Sweden — Sweden!” he told the crowd of supporters. “Who would believe this? Sweden!”
But Swedish authorities reported no terror-related incident or other episode involving...