Commentators say the attack has marked the end of an era in which Poland was widely regarded as an island of safety.
"Poland is beginning to see certain patterns of behaviour, originating in the United States, Western Europe and the Middle East, taking hold here, albeit with some delay," security expert Artur Dubiel told public broadcaster Polish Radio.
"Poles are now witnessing events they had previously only seen in the media," he said.
He added: "I would indirectly point the finger at politicians for having played a part in this. Of course, this cannot be proven, but they seem to have deeply divided our society."
Michał Owczarek has more.
Click on the audio player above to listen to his report