The World Health Organization's (WHO) Director-General Tedros Adhanom says reports of blood clots in people who have received COVID-19 vaccines does not necessarily the occurrence is linked to the jabs.

Speaking at a COVID-19 briefing on Monday, Tedros said his organization was aware multiple countries had suspended the use of AstraZeneca COVID-19 vaccines following reports of blood clots in people who had received the vaccine from two batches produced in Europe.

"This does not necessarily mean these events are linked to COVID-19 vaccination, but it's routine practice to investigate them, and it shows that the surveillance system works and that effective controls are in place," he said.

The WHO chief announced that the organization's Advisory Committee on Vaccine Safety is reviewing the available data and is scheduled to meet tomorrow on the same.

Countries that have suspended the use of the AstraZeneca shots include Romania, Netherlands, Italy, Ireland, Bulgaria, Denmark and Norway, Luxembourg, Estonia, Lithuania, and Latvia.