Anonymous blackmailers are threatening to spread Ebola in the Czech Republic if the country’s government does not pay them a million euros, in Bitcoin.

An email allegedly from the blackmailers, published on Monday by the country’s top commercial TV station TV Nova, claimed they had “biological material” from an infected patient in Liberia.

“An unknown perpetrator or perpetrators are blackmailing this state, threatening to spread the Ebola virus,” Zdenek Laube, the country’s deputy police chief, told reporters, according to AFP.