EMA's Marco Cavaleri states a clear link exists between AstraZeneca vaccine and rare blood clots, though cause remains unknown. EMA to issue statement soon; countries like Germany, Italy, France, Spain, and the Netherlands have restricted vaccine use to older age groups pending investigation. MHRA's Dr. June Raine says no decision on regulatory action yet, urging continued vaccination. Professor Neil Ferguson raises concerns about young people receiving the shot due to rare clot risk.