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Brussels explosions: Eurostar trains cancelled after attacks Brussels explosions: UK police increase presence after attacks
(35 minutes later)
Eurostar has cancelled all services between London and Brussels, while David Cameron is to hold an emergency response meeting, after attacks in the Belgian capital leave at least 13 dead. UK police numbers have been stepped up at "key locations", including transport hubs, after terror attacks in Brussels left at least 13 people dead.
The blasts hit Brussels Airport and a metro station shortly after 07:00 GMT. The blasts hit Brussels Airport and a metro station in the Belgian capital shortly after 07:00 GMT.
The Foreign Office is advising British nationals in the Belgian capital to avoid crowded areas and has issued an emergency number - 020 7008 0000. Prime Minister David Cameron is to hold a meeting of the UK's emergency response committee Cobra on Tuesday.
Heathrow and Gatwick have stepped up security, with some flights cancelled. The Foreign Office is advising UK nationals to avoid crowds and issued an emergency number - 020 7008 0000.
Heathrow and Gatwick have stepped up security, while flights between the UK and Brussels are disrupted.
Brussels Airport issued a statement confirming all flights were cancelled, with passengers advised to contact their airlines.
'Do all we can'
Flights from the UK that were in the air when the attacks happened have been diverted to other Belgian and Dutch airports.
Mr Cameron, who will chair a Cobra meeting later, tweeted: I am shocked and concerned by the events in Brussels. We will do everything we can to help."
Brussels explosions 'leave 20 dead'
Brussels blasts - latest updatesBrussels blasts - latest updates
In Pictures: Brussels blasts
The attacks come four days after Salah Abdeslam, a key suspect in the Paris attacks, was captured in Brussels.The attacks come four days after Salah Abdeslam, a key suspect in the Paris attacks, was captured in Brussels.
The Belgian government has confirmed casualties at the airport but has given no numbers. The cause of the explosions is unknown.The Belgian government has confirmed casualties at the airport but has given no numbers. The cause of the explosions is unknown.
Belgium has raised its terror threat to its highest level.Belgium has raised its terror threat to its highest level.
In the latest developments:In the latest developments:
The UK's most senior counter-terrorism officer, Mark Rowley, said the increase in police presence around the UK was a "precaution" and not in response to any specific information or intelligence.
In London, he said the Met were putting more police on duty to carry out patrols at key locations.
The UK terror threat level has stayed at "severe" since August 2014, meaning an attack is highly likely.