"A package with unknown white powder was delivered to the Czech embassy in Slovakia on Thursday evening. Analysis conducted that night confirmed that it was a life threatening toxic substance. We are working closely with our Czech colleagues, over the investigation into this incident." Gaspar said.
The package was mailed from Sweden, the police chief said.
One embassy worker came into direct contact with the dangerous package when it was delivered, police said. The worker is currently under medical supervision.
In recent weeks, a number of envelopes containing unidentified white powder have been mailed to Czech ministries, the office of the Czech Republic president and some media offices. Two of them, addressed personally to Interior Minister Milan Chovanec and Finance Minister Andrej Babis, contained highly toxic poison.
As a result, the Czech Republic introduced a heightened security regime in all governmental offices and foreign embassies at the end of November.