U.S. health officials said Friday local time that no direct link has been found between the pharmaceutical company Johnson & Johnson’s coronary vaccine and blood clots.

The country's Food and Drug Administration says it will continue its investigation.

The European Medicines Agency's EMA Pharmacovigilance Risk Assessment Committee said it had previously launched an investigation into the possible link between the pharmaceutical company's vaccine and blood clots.

According to the EMA, four cases of rare blood clots associated with low platelet counts have been reported in Johnson & Johnson vaccine recipients. One person is said to be dead.