Foreign substances have been found in another lot of the Moderna coronavirus vaccine. They were spotted at a large vaccination center in the southern prefecture of Okinawa on Saturday.
A pharmacist spotted black substances in a syringe with the vaccination dose.
Later, another syringe and a vial were found to be containing black substances. And pink substances were found in a different syringe filled with vaccine.
Okinawa Prefecture halted vaccination at the site and it remains suspended on Sunday.
On Thursday, Japan's ministry of health suspended the use of doses from three lots as foreign substances had been found in unopened vials of the Moderna vaccine at multiple vaccination sites.
The three lots were made at the same factory during the same period. Foreign substances were found in one of the lots and none were found in two others.
Takeda Pharmaceutical, which handles distribution in Japan, will analyze the situation and look into the possibility of contamination during the production process.
It will decide on what responses should be taken in coordination with the ministry.