Thailand is stepping up security at embassies and tourist destinations after receiving intelligence that 10 Syrians with links to Islamic State entered the country to carry out attacks against Russian interests.

Russia’s intelligence service warned the Thai authorities that the suspected militants entered the country between Oct. 15 and 31, deputy police spokesman Songpol Wattanachai said in Bangkok on Friday. The 10 are believed to have gone to Bangkok, Pattaya and Phuket, popular destinations for Russian tourists.

Islamic State has been targeting Russia over its support for the Assad regime in Syria and its stepped up bombing campaign against the militant group there. Islamic State claimed responsibility for downing a Russian tourist plane in Egypt in October, killing 224.

Phones at Russia’s Federal Security Service, or FSB, were repeatedly busy when called for comment and the FSB didn’t immediately respond to an e-mail request.

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