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Jeremy Corbyn has reacted to "terrible" reports of a terror attack in Barcelona.

And London Mayor Sadiq Khan branded the attack "barbaric."

The Labour leader said: "Terrible reports from Barcelona.

"My thoughts are with those killed and injured, and the emergency services working to save lives."

The attack has left 13 dead and 32 injured, 10 seriously, after a van ploughed into pedestrians on the famous Las Ramblas street.

The vehicle mounted the pavement along the famous promenade - sparking a manhunt for the driver.

(Image: Barcroft Media) (Image: AFP)

In a statement, Prime Minister Theresa May wrote: "My thoughts are with the victims of today’s terrible attack in Barcelona and the emergency services responding to this ongoing incident. The UK stands with Spain against terror."

Foreign Secretary Boris Johnson reacted on Twitter, writing: "Concerned and saddened by Barcelona attack. Our thoughts are with those affected. Doing all we can to identify whether Brits need help."

Earlier the Foreign Office issued guidance, advising people to stay inside and away from the city's Las Ramblas district.

Donald Trump condemned the attack, offering to do "whatever is necessary" to help Spain in the aftermath.

He tweeted: "The United States condemns the terror attack in Barcelona, Spain, and will do whatever is necessary to help. Be tough & strong, we love you!"

Earlier, his wife Melania offered her "thoughts and prayers" to Barcelona on Twitter.

Labour leader Jeremy Corbyn tweeted to say: "Terrible reports from Barcelona.

"My thoughts are with those killed and injured, and the emergency services working to save lives."

(Image: AFP)

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There are also reports of hostages being taken in a Turkish restaurant.

Writing on Twitter, Sadiq Khan said: "My thoughts are with the victims of this barbaric terrorist attack in the great city of Barcelona and with their brave emergency services."

The foreign office issued a warning for British tourists to avoid the area.

Britain's Ambassador to Spain, Simon Manley, said: "We are in contact with the authorities and seeking further information following the incident in Barcelona."

Updating travel advice, the Foreign Office said: “The British Embassy in Madrid and Consulate General in Barcelona are in contact with local authorities and urgently seeking further information following reports of an incident in central Barcelona.

“Local authorities have advised people to stay inside and stay away from the Las Ramblas area of the city.

“If you’re in the immediate area you should take care and follow the advice of the local security authorities.”