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Britain will do “everything it can to help” after reports of a series of explosions in Brussels, David Cameron has said.
Two blasts have rocked Brussels Zaventem international airport while another has been reported at a metro station in the Belgian capital.
The blast at the Maalbek metro station occurred in the close vicinity of the European Union institutions.
“I am shocked and concerned by the events in Brussels,” Mr Cameron posted on Twitter shortly after the news broke.
“We will do everything we can to help.”
People are evacuated from the Schuman station in Brussels (Evan Lamos/Twitter) Mr Cameron himself has spent much time in Brussels recently, in and out of European Union summits to renegotiate Britain's membership of the bloc.
In pictures: Terror attacks at Brussels airport Show all 30 1 /30In pictures: Terror attacks at Brussels airport In pictures: Terror attacks at Brussels airport A man carries an injured person in Brussels Airport, after explosions ripped through the departure hall
In pictures: Terror attacks at Brussels airport Travellers get to their feet in a smoke filled terminal at Brussels Airport after explosions
In pictures: Terror attacks at Brussels airport A man is wounded in Brussels Airport in Brussels
In pictures: Terror attacks at Brussels airport A man speaks on a mobile phone in Brussels Airport, after the explosions ripped through the departure hall
In pictures: Terror attacks at Brussels airport Belgian police officers detain a man at the Gare du Midi train station in Brussels
In pictures: Terror attacks at Brussels airport A police officer stands guard as people are evacuated from Brussels airport, after explosions rocked the facility in Brussels
In pictures: Terror attacks at Brussels airport People stand near Brussels airport after being evacuated following explosions that rocked the facility in Brussels
In pictures: Terror attacks at Brussels airport Crew and passengers are evacuated from Zaventem Bruxelles International Airport after an attack in Brussels
In pictures: Terror attacks at Brussels airport Passengers gather near Brussels airport in Zaventem, following its evacuation after blasts rocked the main terminal of Brussels airport
In pictures: Terror attacks at Brussels airport Two women wounded in Brussels Airport in Brussels
In pictures: Terror attacks at Brussels airport Passengers and airport staff are evacuated from the terminal building after explosions at Brussels Airport in Zaventem near Brussels
In pictures: Terror attacks at Brussels airport Passengers and airport staff are evacuated from the terminal building after explosions at Brussels Airport in Zaventem near Brussels
In pictures: Terror attacks at Brussels airport Broken windows seen at the scene of explosions at Zaventem airport near Brussels
In pictures: Terror attacks at Brussels airport People leave the scene of explosions at Zaventem airport near Brussels
In pictures: Terror attacks at Brussels airport People are evacuated from the scene after two explosions were heard at Brussels Airport
In pictures: Terror attacks at Brussels airport People wait outside of the Brussels Airport after evacuation
In pictures: Terror attacks at Brussels airport People leave the airport area after explosions at Brussels Airport in Zaventem
In pictures: Terror attacks at Brussels airport Passengers comfort each other as they are evacuated from the terminal building after explosions at Brussels Airport in Zaventem
In pictures: Terror attacks at Brussels airport People react as they walk away from Brussels airport after explosions rocked the facility in Brussels
In pictures: Terror attacks at Brussels airport Emergency services attend the scene of explosions at Zaventem airport near Brussels
Reuters
In pictures: Terror attacks at Brussels airport Injured people at the scene at Brussels Airport after two explosions were heard
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In pictures: Terror attacks at Brussels airport The aftermath of the explosions at Brussels airport
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In pictures: Terror attacks at Brussels airport People wait outside of the Zaventem airport after two explosions were heard
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In pictures: Terror attacks at Brussels airport Emergency services at the scene of explosions at Brussels Airport
In pictures: Terror attacks at Brussels airport A view of the scene after the explosions at Brussels airport
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In pictures: Terror attacks at Brussels airport Emergency services at the scene of explosions at Zaventem airport near Brussels
Reuters
In pictures: Terror attacks at Brussels airport The aftermath of the explosions at Brussels airport
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In pictures: Terror attacks at Brussels airport The view of the Brussels airport after the explosion
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In pictures: Terror attacks at Brussels airport Smoke is seen at Brussels airport in Brussels
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In pictures: Terror attacks at Brussels airport A photo shows cars on a blocked highway near Zaventem, Brussels National airport, after two explosions rocked the main hall of Brussels Airport
Getty Images
The Belgian Government has said there have been a number of casualties in the explosions, but has not yet released any figures.
Belgium’s terror alert level is at the highest level following the arrest in the city of Salah Abdeslam, who authorities allege to have been centrally involved in the Paris terrorist attacks of November last year.
The city is no stranger to terrorist attacks. In May 2014 a gunman opened fire at the city's Jewish museum, killing four people.
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