It’s reported that Russian missiles have landed in Poland near its border with Ukraine, killing two people on a farm.
It came on a day that Russia launched a mass wave of missile attacks across Ukraine.
Russia dismissed claims that it was responsible for the missile strike in Poland, calling them "a deliberate provocation in order to escalate the situation".
The US and other international powers said they were investigating and did not immediately attribute blame.
The Polish government has been holding emergency talks and said it was putting some military units on heightened alert.
If the missiles are confirmed to be Russian, it would mark the first time its missiles had landed on the territory of a Nato member, raising the question of how the security alliance would respond.
There has been speculation that the strikes in Poland could be due to a missile malfunction, or the result of Ukraine’s air defence systems knocking a Russian missile off course.
Ukraine’s President Volodymyr Zelensky accused Moscow of deliberately attacking Poland and demanded a tough NATO response.
Huw Edwards presents BBC News at Ten reporting by Jeremy Bowen in Ukraine and Steve Rosenberg in Moscow.
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