Israel’s national security council called on Israelis on Wednesday to immediately leave some tourist areas in southern Sri Lanka over the threat of a possible terrorist attack.

The agency said the warning pertained to the area of Arugam Bay and beaches in the south and west of Sri Lanka, and stemmed from “current information about a terrorist threat focused on tourist areas and beaches”.

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The security council did not specify the exact nature of the threat and called on Israelis in the rest of Sri Lanka to be cautious and refrain from holding large gatherings in public areas.

“The Israeli security establishment … is in close contact with the security authorities in Sri Lanka and is following the developments,” it said.

The U.S. embassy in Sri Lanka also released a security alert stating it had received “credible information warning of an attack targeting popular tourist locations in the Arugam Bay area”.

“U.S. citizens are strongly urged to avoid the Arugam Bay area until further notice,” it added but did not give details.

Germany’s Foreign Ministry also urged travellers to avoid the area or to leave it as soon as possible, citing “indications of possible attacks on tourist destinations”.

Police security has been beefed up in the area and officials are on high alert, police spokesperson Nihal Thalduwa said in a video statement released in Colombo.

“This area is a popular spot for surfing and this has attracted a large number of Israeli tourists. We are working to ensure they remain safe,” Thalduwa said.

Sri Lanka, famed for its pristine beaches, tea plantations and historic temples, is seeing a resurgence in tourists as the island nation recovers from a severe financial crisis.

In the first eight months of this year, 1.5 million tourists arrived in Sri Lanka, including a total of 20,515 from Israel, government data showed.