Brussels has cancelled its New Year's Eve fireworks display because of a terror threat, the city's mayor has said.
"We are forced to cancel considering the risk analysis done by the Crisis Centre," mayor Yvan Mayeur told the French-language RTBF network.
Two suspected members of an Isis cell were arrested on suspicion of planning attacks in Belgium over the holidays.
Military-style uniforms, computer equipment and Isis propaganda were found during police raids in Brussels and the Flemish Brabant and Liege regions.
Six people were taken into questioning but four have since been released.
The prosecutor's office said the searches revealed "the threat of serious attacks that would target several emblematic places in Brussels and be committed during the end-of-year holidays".
Brussels was home to four of the radical Islamist attackers who killed 130 people in Paris on 13 November.
Additional reporting by agencies