The US Department of Defense said it trusts Poland's investigation into the missile attack.
The US Department of Defense added that the missile that hit poland was launched from Ukrainian defenses.
Polish President Andrzej Duda said early Wednesday that he had no concrete evidence of who fired the missile, but said it is a "Russian-made one".
So that it could be possible that it was launched by Ukraine's air defenses which use Soviet-era weapons.
the Polish military is on high alert and the Security Council is due to meet.
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