ISIS has sent more fighters to Europe
Belgian authorities are investigating information that suggests the Islamic State group has sent more fighters to Europe.
Paul Van Tigchelt, the head of Belgium's security threat analysis centre, said that "signals appear to suggest that IS has again sent fighters to Europe, to our country".
Belgium will remain on its second highest alert level because "the threat is still there, it's serious and possible", Mr Van Tigchelt said.
Belgian authorities believe they have "destabilised" the network that carried out the March 22 suicide attacks on Brussels airport and its subway, he said.
The perpetrators have been closely linked to the group that carried out the attacks in Paris on November 13.