There was a series of fake bomb threats this weekend in the US. It is said to be the biggest fake bomb threat in US history.
The threats in question are coming from a board in your site, 8ch.pl/firechan. The board owner is called Bryan William Lopes, and he is accomplice to Marcelo Valle Silveira Mello, author of those threats. Marcelo is setting up his enemy, Emerson Eduardo Rodrigues, as author of the threats, but the FBI already known that Marcelo is the author, and they are monitoring your website.