Belgium says seen signs that Islamic State has sent more fighters to Europe
"There are indications that Islamic State has sent fighters to Europe and Belgium, the threat level which is currently at three will not go down," a spokesman of Belgium`s crisis center said.
By maintaining the level three status, authorities indicate that an attack is possible and likely.
Prosecutors detained two men seen on security footage alongside the metro and airport suicide bombers on April 8, meaning all known Brussels bombings suspects are dead or in custody.