BRITISH tourists in the Caribbean have warned an ISIS terror attack is "very likely" during carnival celebrations in Trinidad and Tobago.

The Foreign Office warned to avoid crowded places after cops discovered a suspected plot to target the Mardi Gras festivities on Monday and Tuesday.

6 Caribbean island nation Trinidad and Tobago is on high alert for an ISIS terror attack during carnival next week Credit: Getty - Contributor

In a dramatic late-night announcement, the Foreign Office said: "The Trinidad and Tobago authorities have arrested some individuals who planned to carry out attacks against Carnival on February 12 and 13."

Officials added: "An attack is still possible. The Trinidad and Tobago government is increasing security measures for the Carnival.

"Terrorists are very likely to try to carry out attacks in Trinidad and Tobago.

"Attacks could be indiscriminate, including in crowded spaces and places visited by foreigners. You should remain vigilant and avoid crowded places and large gatherings."

6 Police arrested a number of suspects believed to be targeting this year's event, but warned an attack is still possible Credit: Getty

6 The Foreign Office warned Brits to avoid crowded carnival streets, which are a soft target fort jihadis Credit: Getty

Around 30,000 Britons a year visit the country. Some have family links to Trinidad but most are tourists heading to Tobago, which has direct flights from London on BA and Virgin.

Surprisingly, the island nation of just 1.3million has the highest ISIS recruitment rate of any country in the Western hemisphere.

Around 125 people are feared to have travelled to fight in Syria and Iraq, and they pose a severe threat when they return home. Authorities are also wary of home-grown terrorists radicalised in the country.

The Foreign Office travel advice update warned: “There’s a threat from individuals who may have been inspired by terrorist groups, including Daesh and al Qaeda, to carry out so-called ‘lone actor’ attacks targeting public events or places.”

6 Trinidad and Tobago faces a threat from the 125 nationals who joined ISIS in Syria and Iraq when they return home

6 The idyllic holiday destination is has the highest ISIS recruitment rate in the West Credit: Getty - Contributor

The crowded streets during carnival would be a soft target for an ISIS-inspired bomb or truck attack.

Last year Trinidad jihadi Shane Crawford, who goes by the nom-de guerre Abu Sa'd at-Trinidadi, featured in the group's propaganda magazine.

The sniper called on ISIS supporters back home to "attack the interests of the Crusader coalition", including embassies, businesses and civilians.

He said: "Follow the example of the lions in France and Belgium, the example of the blessed couple in California, and the examples of the knights in Orlando and Nice.

"You have the ability to terrify the disbelievers in their own homes and make their streets run with their blood."

6 Trinidadian jihadi Shane Crawford, an ISIS sniper, featured in the group's propaganda magazine Dabiq

Trinidad and Tobago, the southernmost nation in the Caribbean, is ethnically diverse with many people of African and Indian heritage as well as Chinese, European and Arab minorities.

Around 5 per cent of the population are Muslim, according to the 2011 census.

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A small radical group known as Jamaat al-Muslimeen (“Community of Muslims”) launched a coup attempt in 1990, led by a convert named Yasin Abu Bakr who is now an imam on Trinidad and hosts a weekly radio show.

Last night it emerged the remaining two Brit members of the "Beatles" beheading gang led by Jihadi John had been captured in Syria.

Last month we revealed the world's tourist terror hot spots at "high risk" of attacks.

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