Poland claimed the US told them it was a cruise missile, but according to a twitter post the US has denied this
The remains of the explosion don't line up, at all, with the pattern left by a cruise missile. Rather it looks much more like a shoulder-fired surface-to-air missile, which have crash-landed in Poland before during the course of this war - mind you they're being used by Ukraine, not Russia (who prefers to use more sophisticated means for taking down Ukrainian aircraft)
What seems to be happening is a conservative Polish tabloid has baselessly accused Russia of targetting a civilian target in Poland, and NATO-aligned news sources have ran with the story. This isn't unlike DailyMail claiming Covid started in China because "evil yellow man eat bat"