The Foreign Office has issued an urgent warning for British tourists travelling to Spain.
Nearly 19 million British nationals visited Spain last year , with most visits being trouble-free.
But the Government is now warning visitors of increased security over Christmas and New Year.
Writing for Foreign Travel Advice, they said: "There is a general threat from terrorism.
"There may be increased security in place over the Christmas and New Year period, including at major events that might attract large crowds.
"You should remain vigilant and follow the advice of local authorities."
Attacks could be indiscriminate, including in places visited by foreigners.
The Spanish authorities take measures to protect visitors, but you should be vigilant and follow the instructions of the local authorities.
On 17 and 18 August 2017, there were two terrorist-related incidents where vehicles were driven directly at pedestrians, resulting in injuries and loss of life.
These were in the Las Ramblas area of Barcelona and Cambrils, near Salou (100km southwest of Barcelona).
There’s a heightened threat of terrorist attack globally against UK interests and British nationals from groups or individuals motivated by the conflict in Iraq and Syria. You should be vigilant at this time.
