Brussels Airport reopens with three "symbolic" flights and strict additional security checks for passengers, marking a new era for air travel in Belgium after attacks by Islamic State suicide bombers.

A man known as Faycal C, arrested and charged in Belgium with terrorist offences after the Brussels attacks, is released for lack of evidence.

Police presses ahead with the search for suspects in Belgium's worst ever terror attack, as a series of raids and arrests reveal more links with the November Paris killings and a new French plot.

Scores of people remain in intensive care following suicide Tuesday's bomb attacks in Brussels that left 31 people dead, Belgium's health minister says.

Two brothers carried out suicide bombings at Brussels airport and on the metro on Tuesday, the federal prosecutor confirms.

Authorities in Europe and beyond have tightened security at airports, on subways, at the borders and on city streets after deadly attacks on Brussels.

Police in Brussels arrests six people in connection with an alleged plot to target the city on New Year's Eve, prosecutors say.

Security is being stepped up in major European cities ahead of New Year celebrations, with officials wary of possible terror plots.

Belgian police arrest two people suspected of planning attacks in Brussels on New Year's eve.

Facebook says it will block access to its website by non-members in Belgium, as it battles a court order to stop tracking Internet users who do not have accounts with the US social media giant.

French police are examining what appears to be a suicide bomb belt dumped on a Paris street, 10 days after the attacks that killed 130 people.

The US has issued a worldwide travel alert for its citizens in response to "increased terrorist threats".

Belgian police have made 16 arrests in anti-terror raids but suspected Paris attacks gunman Salah Abdeslam remains at large, the authorities have said.

Belgium raises its terror alert to the highest level in the capital Brussels on Saturday, with the OCAM national crisis centre warning of an "imminent threat" a week after the Paris attacks.

Belgium raises alert status for its capital Brussels to the highest level on Saturday, shutting the metro and warning the public to avoid crowds because of a "serious and imminent" threat of an attack.

Football friendly between Belgium and Spain scheduled for Tuesday in Brussels has been cancelled on the recommendation of the national crisis centre following the Islamist attacks in Paris.

France's security services are once again facing a harsh spotlight after failing to prevent the brutal attacks in Paris carried out by the Islamic State group.

"A breeding ground for violence" the mayor of Molenbeek called her town, speaking of unemployment and overcrowding among Arab immigrant families, of youthful despair finding refuge in radical Islam.

The Netherlands' miserable European Championship qualifying campaign came to an end with a 3-2 defeat to the Czech Republic on Tuesday.

Wales reach their first major tournament finals in 57 years in bizarre circumstances as they qualify for Euro 2016 despite defeat in Bosnia-Herzegovina.