Not US sources. It seem to comes from the Radio ZET post this points to "Polish media reported that two people died Tuesday afternoon after a projectile struck

Not US sources. It seem to comes from the Radio ZET post this points to "Polish media reported that two people died Tuesday afternoon after a projectile struck an area where grain was drying in Przewodów, a Polish village near the border with Ukraine." ZET seems a legitimate source, but it's still a single journalist and some twitter posts. More coverage at https://wiadomosci.radiozet.pl/Polska/przewodow-rakiety-spadly-na-polske-amerykanski-wywiad-potwierdza-ze-byly-rosyjskie https://wiadomosci.radiozet.pl/Polska/przewodow-rakiety-spad...