Denmark is suspending the use of the Oxford-AstraZeneca vaccine for two weeks as it investigates reports of some patients developing blood clots after being inoculated, days after several other EU countries suspended use of a specific batch of the vaccine.

Danish Health Minister Magnus Heunicke said Thursday authorities were looking into "signs of a possible serious side effect in the form of fatal blood clots," though he made clear it was a "precautionary measure," saying it was not possible yet to conclude whether the clots were linked to the vaccine.

"We act early, it needs to be thoroughly investigated," he said in a tweet.

The Danish Health Authority also confirmed the suspension in a statement, saying its investigation would include looking into one death in Denmark.

"We are in the middle of the largest and most important vaccination rollout in Danish history. And right now we need all the vaccines we can get. Therefore, putting one of the vaccines on pause is not an easy decision. But precisely because we vaccinate so many, we also need to respond with timely care when there is knowledge of possible serious side effects. We need to clarify this before we can continue to use the vaccine from AstraZeneca," Søren Brostrøm, director of the National Board of Health, said in the statement.

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