Two people in Japan have died after receiving injections of Moderna’s Covid vaccine. These two men from Japan had been vaccinated from the batch which was subsequently suspended.

Both men were in their 30s and died within days of receiving the second dose of the Moderna vaccine, Japan’s health ministry reported.

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“At this time, we have no evidence that these deaths are caused by the Moderna COVID-19 vaccine,” Moderna and Takeda said in a statement on Saturday. “It is important to conduct a formal investigation to determine if there is a link.”

For now, the cause of death is still unclear but the authorities have opened an investigation into the matter.

For now, the doses are believed to have come from the same stock that had been suspended previously. Japanese authorities have suspended 1.63 million doses of the Moderna Covid vaccine that had been shipped to 864 centers across the country. The decision came more than a week after Japanese national distributor Takeda Pharmaceutical Co reported that some vials could be contaminated.

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However, the government says the suspension of the Moderna lots was just a precaution.

Experts avoid establishing a link between the death of Japanese men and their vaccine intake. “There may only be a temporal relationship between vaccination and death,” Fumie Sakamoto, head of infection control at St. Luke International Hospital in Tokyo, told Reuters. “There is so much that we still don’t know to draw conclusions about these two cases.”