An envelope with insects' poison inside was brought to the Polish Embassy in Moscow.
According to Onet.pl, similar incidents - with envelopes containing are observed at diplomatic offices of other EU member countries - Hungary, Bulgaria, Romania, France, the Netherlands and the Czech Republic. The incidents have been reported across these Moscow-based offices over the week.
The unknown senders signed several letters as if they were sent by Russian MP Sergei Zheleznyak, who represents 'United Russia' party. He already turned to law enforcers for due investigation of what he referred to as an act of defamation.
The Polish embassy refused to comment the incident.