Belgium maintained maximum security for the capital Brussels on Sunday, with a further review by intelligence, police and judicial services set for later in the day.
The Belgian crisis centre, which advises the government on security, said in a tweet that Brussels remained on the maximum level four, indicating a "serious and imminent" threat of an attack, while the rest of the country would at be at level three, meaning a possible and probable threat.
Belgium put Brussels on maximum security alert on Saturday, shutting the metro and warning people to avoid crowds because of the threat of co-ordinated, multiple attacks by militants.
