Ukrainian embassies and consulates in six European countries have received packages containing animals' eyes in recent days, a Ukrainian official said Friday.

Foreign Ministry spokesman Oleh Nikolenko wrote on Facebook that the “bloody parcels” were received by the Ukrainian embassies in Hungary, the Netherlands, Poland, Croatia and Italy, as well as by consulates in Naples, Italy; Krakow, Poland and the Czech city of Brno,, according to AP.

He said that “we are studying the meaning of this message.” “It’s a very strong signal,” the Ukrainian consul in Naples, Maksym Kovalenko, said, confirming his office received two letters containing fish eyes at around 10:30 a.m. Thursday.

Nikolenko said the parcels arrived after a package containing an explosive device sent to the Ukrainian Embassy in Madrid ignited upon opening on Wednesday and injured an employee.

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