Japan has put a batch of Moderna’s Covid-19 vaccine on hold after a foreign substance was found in a vial.
According to authorities in Japan, a pharmacist saw several black particles in one vial of the vaccine in Kanagawa Prefecture.
Some 3,790 people had already received shots from the batch.
The rest of the batch has now been put on hold.
Local media reports say there is no evidence so far of any health hazards caused by the potentially contaminated vaccine.
It comes less than a week after Japan suspended the use of about 1.63 million Moderna doses due to contamination.
Spanish pharmaceutical firm Rovi, which bottles the vaccine, said in a statement that a manufacturing line in Spain could be the cause of the issue.
It added that it was conducting an investigation.