Wednesday's police operation in Brussels comes one week after an Islamic extremist shot dead two Swedes and wounded a third in the Belgian capital.
Security tensions were running high on Wednesday ahead of a European Union summit in Brussels, with police launching a search for a man they wanted to question over reports of unspecified threats.
The Brussels prosecutor's office later said authorities had detained a man in the case and were checking his identity.
The police operation came one week after an Islamic extremist shot dead two Swedes and wounded a third in the city. Authorities said the Tunisian suspect died following a police operation trying to arrest him.
The search for the man wanted in connection with the unspecified threats comes on the eve of the two-day European Union summit, which starts on Thursday in Brussels, where the 27 EU leaders will discuss, among other things, the Israel-Hamas war.
Last week's killings laid bare inefficiencies within the government and judicial apparatus, which had allowed the suspect to roam free in Brussels even though Tunisia had actively sought his extradition. The justice minister resigned over the incident last weekend.
Since the attack, the terror alert level in Belgium was raised to the second-highest level, meaning the threat is considered “serious.”
The federal prosecutor’s office also announced on Wednesday that it detained a suspect with the semiautomatic rifle that was used to kill the two Swedes. He will be questioned later on Wednesday before a decision on an arrest is made.