Denmark and Norway have both temporarily suspended use of the Oxford-AstraZeneca vaccine after officials received reports of fatal or life-threatening blood clots in a small number of people. AstraZeneca says the safety of its vaccine has been studied extensively, and both the EU and UK drugs regulators say there is no evidence of a link between the vaccine and the clots. The number of cases in vaccinated people was no higher than in the general population, the EU regulator adds. Our health editor Michelle Roberts says it “may sound worrying, but it is not yet known if there is any connection between the two things”.