Polish Prime Minister Donald Tusk has said the "worst suspicions have been confirmed" and that a bomb had damaged the railway track along the route between Warsaw and Lublin, near the border with Ukraine, in "an unprecedented act of sabotage" aimed at undermining Poland's security. Poland is a NATO ally and a hub for Western support for Ukraine’s war against Russian invaders. Tusk noted that the line hit is "crucially important for delivering aid to Ukraine." Tusk did not say immediately who