The Belgium national football team have cancelled training on Tuesday after the deadly attacks in the capital Brussels.
There have been multiple fatalities after two explosions ripped through Zaventem Airport on the outskirts of the city in an apparent suicide attack - and a third blast hit the Maalbeek Metro station in the city centre.
Belgium are due to host a friendly against Portugal next Tuesday at the King Baudouin Stadium in Brussels.
A tweet from the Belgian team's official account, @BelRedDevils, read: "#tousensemble, our thoughts are with the victims. Football is not important today. Training cancelled."
And the Portuguese FA reacted swiftly, releasing a statement saying: "The Federacao Portuguesa de Futebol is in touch with its Belgian counterpart and the Portuguese, Belgian and international authorities, in view of the events of today and the anticipated game for Tuesday next week."
Norwich City's Dieumerci Mbokani was at the airport at the time of the explosion, but the Premier League club say the former Anderlecht striker was "unharmed, but shaken", and has now returned home to be with his family.
A number of English-based Belgium internationals have taken to social media to express their thoughts on the attacks, including Tottenham duo Jan Vertonghen and Nacer Chadli - two of four Belgians at White Hart Lane along with Toby Alderweireld and Mousa Dembele.
Chadli, tweeted: "We've been in contact with our @BelRedDevils players who are safe and well," while Vertonghen wrote: "I can't believe I'm reading these things again..."
Belgium and Manchester City captain Vincent Kompany sent two messages of support saying: "Horrified and revolted. Innocent people paying the price again. My thoughts are with the families of the victims," before later adding: "I wish for Brussels to act with dignity. We are all hurting, yet we must reject hate and its preachers. As hard as it may be."
Chelsea goalkeeper Thibaut Courtois, a regular in the Belgium side, tweeted: "My thoughts are with the victims and their family."