Three people were arrested in Denmark and one in the Netherlands during dawn raids on Thursday, police said at a press conference.
Prime Minister Mette Frederiksen said the threat was "as serious as it gets".
Authorities did not immediately disclose details of the alleged plot they say they prevented, saying the investigation was ongoing.
The three people arrested in Denmark would be charged with terror offences, Ch Insp Flemming Drejer told reporters. Justice Minister Peter Hummelgaard said the alleged plot "tragically confirms that Danish Jews are under threat", without confirming that the suspects were planning to attack the Jewish community. Danish intelligence chief Anja Dalgaard-Nielsen said the threat against Denmark was linked to the Israel-Gaza war and
burnings of the Quran in Denmark and neighbouring Sweden
