UK tourists visiting Spain for their summer vacation have been warned that the terrorist threat has been raised to "severe".
The warning was issued after ISIS supporters threatened to attack Spanish tourist cities in revenge for the death of British ISIS recruiter Sally Jones.
The Daily Star Online reported that up to 40,000 other Spanish police are being used at tourist hotspots in the popular holiday destination.
Police will guard stations, hotels, beaches and restaurants to provide additional protection against ISIS threats.
This is part of Operation Summer, which aims to "take comprehensive measures to obtain information to prevent acts of terrorism".
The police have increased the terror threat to four out of five, with the higher number being the most serious.
The UK Foreign Office has warned that terrorists will "likely" try to launch attacks in Spain.
"Attacks can be indiscriminate, even in places visited by foreigners," reads the website.
"The Spanish authorities are taking measures to protect visitors. However, you should be vigilant and follow the instructions of the local authorities.
"There is an increased threat of terrorist attacks worldwide against British interests and British nationals of groups or individuals motivated by the conflict in Iraq and Syria.
"You should be vigilant at this time."
Britain also warned of the possibility of "big gatherings" in the Catalan capital, Barcelona, as separatists continue to seek to break away from the rest of Spain.
While these demonstrations have been largely peaceful in the past, strange acts of violence have erupted mainly due to counter-demonstrations with ultra-nationalists.
2017 BARCELONA TERROR ATTACK
Terrorists hit Barcelona in August 2017 when a van on the tourist hotspot deliberately drove Las Ramblas into the crowd, killing 14 people and injuring around 100 more.
Five suspects were shot dead by the police in Cambrils after the group rammed an Audi A3 into People by the Sea, killing one and injuring six.
The IS took responsibility for the jihadist attacks.
And now supporters of the terrorist group have threatened further attacks in the country, with Barcelona and Madrid mentioned as targets.
The terrible threats that surfaced earlier this month in a 33-minute pro-Islamic state video were uncovered by the Middle East research group MEMRI.
The video was found on the telegram file sharing platform and published by ISIS propaganda outlet Muntasir Media.
The film, entitled Behind the Mask, aims to "reveal the true face of the West," as the video suggests.
ATTACKS TO TOURIST CITIES
The last three minutes of the clip are said to threaten attacks in Barcelona or Madrid.
Such attacks are similar to those perpetrated in November 2015 in Paris and are intended to be a revenge for the death of ISIS recruiter Sally Jones.
The images also include potential targets such as New York City's Grand Central Station and a montage of beheaded French President Macron.
Bataclan will not be the last. Barcelona or Madrid can be the next. "
Behind the mask, Muntasir Media
The subtitles for these clips – witnessed by MEMRI and provided by The Sun Online – read: "Bataclan will not be the last, Barcelona or Madrid may be next.
"Islam will dominate, Operation Op-Kuffar, Paris to Barcelona – Just Terror."
The video goes on to say this attack would be revenge for Jones's death.
A headline says, "We're not silent, we're going to take revenge on Umm Hussein Al-Britani and her family."
Behind the Mask is a reworking of another documentary jihadi video released in 2017 by al-Muhajirun, a foreign media group for militants in Syria.
This video describes the "decadence of the West" and encourages viewers to emigrate and flee the lands of "unbelief".
The testimony of German jihadist Andreas Müller, also known as Abd Al-Salam Al-Mujahir Al-Almani, is also included.
Müller describes his conversion to Islam and his accession to jihad.
REVENGE FOR THE WHITE WIDOW
Similarly, Sally Jones left England to marry Junaid Hussain in Syria, where she became one of the leading recruiting officers for ISIS.
The mother of two brought her son to Raqqa in late 3013 and adopted the new name Umma Hussain al Britani.
It is believed that through its influential recruitment network called Raqqa 12, it has led dozens of aspiring European jihadists to join the self-proclaimed caliphate.
Jones is said to have been killed in 2017 by a drone fleeing the slaughter in Raqqa in the direction of the Syrian border town of Mayadin.
We are not silent. We will take revenge on Umm Hussein Al-Britani [Sally Jones]and your family. "
Behind the mask
The CIA and MI6 officials had spent months trying to track them down.
Jones's ISIS husband was also killed by a drone in 2015 and nicknamed The White Widow.
The couple was accused of planning ISIS terrorist attacks on three continents.
They had also been linked to a conspiracy to blow up the Queen and Prince Philip on the streets of London during the VJ celebrations.
Muntasir Media added another three minutes to the original video, with edited archive footage of ISIS videos and Western media material from the ISIS terror campaign in the West.
A clip asks the followers: "Kill [unbelievers] wherever you find it. "
The new material is underpinned by an Islamic-religious song titled My Vengeance.
The soundtrack confirms and praises the ISIS attacks in November 2015 in Paris and in March 2016 in Brussels.
An Arabic text states, "Our group will be victorious if Allah wishes, while your groups dwindle and sink."
Who was Sally Jones?
SALLY Jones left her home in Chatham to become a jihad bride on the battlefields of Syria. She took the eight-year-old Jojo with her, but left behind an older son.
In Raqqa, former singer-songwriter Junaid Hussain, whom she met online, married and adopted the name Umm Hussein al-Britani.
At home, her distraught family watched her writing anti-Semitic hate messages under a photo of herself wearing a niqab and waving an AK-47.
In a propaganda post she posed as a nun with a gun and spoke of her desire to behead Christians with a "beautiful blunt knife".
Hussain was killed by a US Army drone in Raqqa in 2015 – and Jones became known as the White Widow.
She also became a prolific recruiter for IS and her name was put on a US killing list.
But it did not stop them from promoting terrorist attacks in the West. In an article from 2016 she wrote: "I wish you a nice summer. I would not go to central London until June or July. Well, to be honest, I would not go there by tube. "
Her last appearance on social media was in September 2016.
She said, "I will never marry again, I will keep faith with my husband until my last breath."