German student investigated on suspicion of trying to blackmail Czech government

A 27-year old German student is being investigated in Sweden on suspicion of having tried to blackmail the Czech government with threats involving an unspecified toxic substance, Swedish media reported citing state attorney Henrik Söderman. No further details were given. Swedish, Czech and German police are reportedly working on the case together with the FBI. In 2014 someone threatened to spread the Ebola virus in the Czech Republic if the government did not pay one million euros. It is not clear if the Swedish investigation pertains to this case.