A Polish plane which arrived at Warsaw Chopin Airport from Chicago early on Tuesday afternoon was swept by bomb disposal units after a report that an explosive could be planted on board.
A gift received by Poland's police chief during his visit to Ukraine exploded on Wednesday morning in a room adjacent to his office, the Interior Ministry has reported.
Polish President Andrzej Duda has appealed for people on the eastern border to remain calm as military activity is increased owing to Tuesday's missile blast.
Andrzej Duda, Poland’s president, has said there is a “high probability” that the missile that killed two people in eastern Poland on Tuesday was fired by Ukraine’s air defences.
The president of the European Commission (EC) has offered Poland the organisation’s full support following an explosion near the Ukrainian border that killed two Poles on Tuesday.
The missile landed near the village of Przewodow, which lies about 10 kilometres from the Ukrainian border, on Tuesday afternoon, and came on a day in which Russia launched dozens of strikes on targets across Ukraine.
The death of two Poles in an apparent strike by a Russian-made missile is the first time since Russia invaded Ukraine that the war has directly affected Poland and claimed lives, a deputy foreign minister said on Wednesday.
The North Atlantic Council, Nato's main decision-making body, will meet on Wednesday at 10 am to discuss Tuesday's missile blast in eastern Poland that claimed the lives of two people, Nato's spokesperson said on Wednesday morning.
No state has air defences capable of protecting all its territory, the General Command of the Polish Armed Forces said on Wednesday.
US President Joe Biden has offered his "full support and assistance with Poland’s ongoing investigation" into an apparent missile explosion near the Ukrainian border on Tuesday.