Belgian media reports as many as 28 people have been killed and 90 injured following multiple explosions at Zaventem airport and the Brussels metro.
- Emergency responders and security forces on the ground after 8:00 am blast.
- Airport evacuated and all air traffic to and from Zaventem suspended.
- Belgian politicians have announced a disaster plan is in effect.
- Blasts planned to cause maximum casualties during rush hour at the departure hall.
- Multiple explosions on Brussels metro at Maalbeek station where at least 15 were killed.
- All UK flights to Brussels and Eurostar links have been cancelled
- Global leaders have offered messages of solidarity with Brussels in the wake of the attack
- British Prime Minister David Cameron is to chair a COBRA meeting to coordinate the UK's response
- Isis has released a statement through the Amaq news agency claiming responsibility for the attacks
A Belgian federal prosecutor said that chemical products, an explosive device, and an Isis flag have been found in police raids on houses in the Schaerbeek area of Brussels.
A Belgian prosecutor said that the two men who appeared in the CCTV footage with the wanted suspect were "probably" suicide bombers. Both men are wearing dark clothing in the footage, and pushing trolleys. The wanted suspect wears a hat and light jacket.
Brussels police have issued a wanted notice for a man suspected of involvement in the attacks on Brussels airport. A picture of the suspect released by police shows a man in a hat with a light jacket pushing a trolley.
Belgian media earlier released a picture of two men in dark clothing pushing trolleys, with the man wearing the hat following just behind.
The European region of Airports Council International (ACI) has rejected calls for additional security screening to be put in place for those entering airport buildings.
"ACI EUROPE underlines that the possible adoption of additional security measures such as checks on persons and goods entering airport landside spaces could be disruptive and actually create new security vulnerabilities," said a spokesman in the statement.
"By displacing the gathering of passengers and airport visitors to spaces not designed for that purpose – such measures would essentially be moving the target rather than securing it."
It notes that recent attacks in Paris, Ankara and Istanbul "are not limited to disrupting our transport systems, but are clearly about threatening our entire way of life by targeting other public spaces including places of social gathering and entertainment.
"Ultimately, fully securing public spaces through additional security checks would be unrealistic and inefficient. The best way forward in the fight against terrorism is to step up capabilities for the gathering, coordination and sharing of intelligence and data."
In response to the attacks, airports throughout Europe have stepped up security, increasing patrols patrols and checks.
Isis has released a full statement, in Arabic and French, claiming responsibility for the attacks.The statement claims the attacks were carried out by a "secret cell" of militants.
"We promise the crusader alliance that they will have black days in return for their aggression against the Islamic State", says the statement.
Earlier the jihadist group said it was behind the attacks through affiliated news agency Aamaq.
Refugees protesting in Idomeni, near the Greek/Macedonian border have expressed solidarity with the victims of the Brussels terror attacks.
The refugees, many fleeing conflict in Syria, are staging a protest in the town, demanding that the border be repoened so they can seek asylum in Europe.
Eight Americans, including three Mormon missionaries and a US serviceman, are among those injured in the attacks, NBC reports. An official told the network that the injuries to the serviceman and four members of his family are not believed to be life threatening.
The missionaries have been identified by The Church of Jesus Christ of Latter-day Saints as 66-year-old Richard Norby, 20-year-old Joseph Empey and 19-year-old Mason Wells. They are currently in hospital after being seriously injured in the explosions at Brussels Airport.
What is alleged to be CCTV footage from a chemists shop in Brussels airport has emerged, showing the impact of the blasts. The explosions occuring moments from each other shake the cameras, causing products to fall from shelves and customers to flee.
A third bomb found at the airport failed to explode and was neutralized by police, the Brussels regional governor told AFP.
Eurostar rail services to and from Brussels have resumed, and customers are advised to allow extra time for added security checks, Sky News reports.
Brussels Airport will remain closed on Wednesday, the CEO of Brussels Airport Company Arnaud Feist has said.
Belgium's De Redactie has broadcast an interview with an official who displays a piece of metal found in one of the victims of today's attacks.
"We have found this inside one of the injured", says the official at the Neder-over-Hembeek military hospital. "This indicates that nail bombs were used in the attacks this morning".
These pictures show Brussels's airport departure hall before and after the devastating explosion this morning.
Democrat US presidential candidate and former Secretary of State Hilary Clinton described the attacks as "deeply distressing".
"It was just terrible horror, the idea that terrorists are continuing to strike at the heart of Europe and now Brussels and the number of casualties from what looked to be fairly sophisticated, coordinated attacks is deeply distressing," Clinton told NBC's Today in a telephone interview.
Clinton called for the US to stand in solidarity with its European allies, and to increase anti-terrorism efforts.
"It's going to be a long challenge because of a lot of factors, including, you know, the easy accessibility to powerful explosives and the mobility of terrorists in today's world, but we've got to be absolutely strong and smart and steady in how we respond," she said.
The Islamic State (Isis) has claimed responsibility for the attacks. The Aamaq news agency linked to the jihadi group has issued the following statement:
Islamic State fighters carried out a series of bombings with explosive belts and devices on Tuesday, targeting an airport and a central metro station in the centre of the Belgian capital Brussels, a country participating in the international coalition against the Islamic State.
Islamic State fighters opened fire inside Zaventem Airport, before several of them detonated their explosive belts, as a martyrdom bomber detonated his explosive belt in the Maalbeek metro station. The attacks resulted in more than 230 dead and wounded.
The White House tweets:
RTL has published a larger version of the image first released by La Dernier Heure. It shows another man in a white jacket that the broadcaster claims is also a suspect in the attack at Brussels airport.
The Belgian interior ministry has declared three days of national mourning.
Belgian tabloid La Dernier Heure has obtained security camera footage which it claims shows the two suspected attackers at the airport.
The Mormon Church says three of its missionaries from Utah were among the casualties of the explosions at Brussels airport.
The Church of Jesus Christ of Latter-day Saints says 66-year-old Richard Norby of Lehi, 20-year-old Joseph Empey of Santa Clara and 19-year-old Mason Wells of Sandy have been seriously injured.
The Belgian national flag has been raised as a mark of respect at Downing Street.
The EU Parliament in Brussels has asked all staff to remain inside the premises until further notice and work from home tomorrow. All parliament buildings with the exception of the main building are to remain closed on 23 March.
"All missions, meetings and visits scheduled for this afternoon and tomorrow have been cancelled," the parliament said in a statement.
Parliament President Martin Schulz said:
I am horrified by the despicable and cowardly attacks which took place in Brussels today. My thoughts go out first and foremost to the victims and the wounded, as well as their families and friends. These acts anger and sadden me at the same time. They are born from barbarism and hatred which do justice to nothing and no one. Brussels, like other cities hit by such terrorist attacks, will stand strong, and the European institutions hosted so generously by the Brussels institutions and its inhabitants will do likewise. In the name of the European Parliament I have expressed to the Belgian Prime Minister my compassion and solidarity towards the Belgian people.