Japan Post said Friday it will suspend its express mail service to Nigeria.

It said a total of 194 letters sent via EMS since the beginning of this year have been undelivered and that it will suspend EMS to Nigeria until a route to ensure such mail is delivered is confirmed. Japan Post said it will continue to handle other types of mail to the African country.

Already accepted EMS to Nigeria that is still in Japan will be returned to senders, it said.

For mail already sent via EMS to Nigeria, Japan Post will reimburse senders and compensate for damages if a delay in delivery is confirmed, it said.