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BANGKOK—Thai police said they were searching for a fifth suspect in this week's alleged botched terrorism plot in Bangkok, while local security forces increased security checks in heavily touristed areas of the city.

Thai authorities have said several Iranian nationals planned to assassinate Israeli diplomats in this Southeast Asian nation amid growing tensions between Iran and Israel over Tehran's nuclear program, following Israel's contention that Iranian-backed operatives were behind bomb plots in India and Georgia, as well as the Thai blasts.

Thai police said the suspects here were using "sticky bombs"—magnetic bombs designed to be attached ...