Japan's Okinawa region suspended the use of Moderna's Covid-19 vaccine on Sunday after another contamination was spotted.
It comes a day after the Japanese health ministry said it was investigating the death of two men who received shots from tainted Moderna batches -- though the cause of their death is unknown.
The suspension came after the health ministry said two men, aged 30 and 38, died in early August after getting their second Moderna doses.
According to the reports, black substances were spotted in syringes and a vial, while pink substances were found in a different syringe filled with vaccine at the Okinawa centre.
"We are suspending the use of Moderna's Covid-19 vaccines as foreign substances were spotted in some of them," local government said in a statement.