Four people recently died in Russia shortly after taking the Sputnik V anti-corona jab in previously unreported cases, which are being taken "seriously" by the EU regulator, the European Medicines Agency (EMA) in Amsterdam.

Axar.az reports six other Russians also had medical complications after taking the vaccine, according to internal case files from RosPotrebNadzor, a Russian body responsible for administering vaccinations, seen by EUobserver.

Three of the deceased were women aged 51, 69, and 74.

The fourth one was not identified in the leaked files.

The deaths were heart, lung, or blood-sugar related and might or might not have been caused by Sputnik V, the dossier of Russian documents indicated.

The other six patients were younger men and women, one of whom was just 25.

They suffered a range of symptoms, including breathing difficulties, convulsions, swelling, muscle weakness, high blood pressure, headaches, dizziness, and fevers after their jabs.