Missiles have landed in Poland near its border with Ukraine, killing two people, reports say.
The reports came after Russia launched a wave of attacks across Ukraine, but it is not yet clear what has happened.
Russia dismissed claims it was responsible, calling them “a deliberate provocation in order to escalate the situation”.
The US and other international powers said they were investigating but are yet to apportion blame.
The Polish government has also not commented, but said it was putting some military units on heightened alert after holding an emergency meeting.