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Last month, police arrested a Lebanese man with dual Swiss citizenship. They identified him as Hussein Atris and suspect he is involved with Lebanese-based Hezbollah terrorists.

When he was arrested, Mr. Atris was in possession of 10 gallons of ammonium nitrate, which can be used to build bombs, authorities said.

After arresting Mr. Atris, police increased security around potential Israeli targets including Bangkok’s synagogues, the Chabad House religious center and the Israeli Embassy.