Two Swedish nationals were shot dead in Brussels late Monday by a suspect who remains at large, in an attack the Belgian prime minister described as "terrorism".
The gunman fled on a scooter and Belgium's security observatory raised its terror alert to level four or "very serious" -- the highest -- for Brussels, and level three nationally.
Belgium's premier, Alexander De Croo, said the shooting had targeted Swedes -- the attack came just before a Belgium-Sweden soccer match -- and European leaders were quick to offer their solidarity.
In a video posted on social media, a man identifying himself as the attacker said "he was inspired by the Islamic State" (IS) extremist group, the spokesman for the federal prosecutor's office, Eric Van Duyse, said on the LN24 news channel.
"I have just offered my sincere condolences to the Swedish PM following tonight's harrowing attack on Swedish citizens in Brussels," De Croo posted on social media.
"Our thoughts are with the families and friends who lost their loved ones. As close partners the fight against terrorism is a joint one."
Several Belgian media outlets said the two individuals killed were wearing football shirts belonging to the Swedish national team ahead of the game between Sweden and Belgium.
The Group F European qualifier match between the two countries was suspended at half-time "due to incidents," the Belgian side posted on social media accounts.
Journalists in the Roi Baudouin stadium in Brussels said around 35,000 fans were being kept in the ground, and the UEFA website said the match had been halted at half-time at one goal apiece.
Belgian media reported that Swedish players did not want to continue the game after the attack.
The Belgium crisis centre said on social media that a third individual had been targeted in the attack but said the person was not in a critical condition.
- 'Stood there frozen' -
A video of a man speaking Arabic and claiming responsibility for the shooting has been circulating on social media.
The federal prosecutor in charge of terrorism cases launched an investigation. Police are only investigating one suspect at the moment based on preliminary information.
The shooting took place in the capital's northern districts. Police had been alerted to the incident after 7 pm local time (1700 GMT).
Police cordoned off the area where the shooting occurred, AFP journalists said.
In a video shared online by Flemish newspaper Het Laatste Nieuws, the shooter is seen with an automatic weapon on his shoulder, fleeing on a scooter.
Four gunshots can be heard in the video.
A witness who spoke to LN24 channel described his shock during the incident.
"I stood there frozen, I didn't move. I was shocked by what happened, even now I am still in shock. It was a man who came, pushed me, told me to stop running if I wanted to stay alive," said the witness, who gave his name as Sulayman.
The Belgian royal palace said it was "shocked" by the shooting.
"Our thoughts are first and foremost with the victims, their families and loved ones. We support the security forces who are currently doing their utmost to track down the perpetrator," the palace said on social media.
- 'Despicable' -
Several metro stations in Brussels were also closed, Belgium's RTBF reported.
The president of the European Commission, which is based in Brussels, was quick to condemn the attack and offer support.
"Tonight, my thoughts are with the families of the two victims of the despicable attack in Brussels," Ursula von der Leyen posted on social media.
"I extend my heartfelt support to the Belgian police, so they swiftly apprehend the suspect. Together, we stand united against terror."
Brussels is home to EU offices including the commission, the European Council, which represents member states, and the European Parliament.
French President Emmanuel Macron said Europe was "shaken" by an "Islamist" attack in Brussels, while France's interior minister had earlier given instructions to strengthen border controls with Belgium.
Belgium, alongside France, had already been the target of an attack claimed by IS extremists in March 2016, at Brussels' main airport and on the metro system, which killed 32 people.
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