Whose side are they on? The Associated Press, and after them ABC News, described an attack on Polish embassy as a "protest" at Polish embassy. That may explain why the attack was not reported in the US media. But, attack on Russian embassy in Warsaw is all over the Internet. This is how "government" (or left) media in the US have always treated their Polish "ally" (or nuisance).
3 Russians Detained for Protest at Polish Embassy