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Over the weekend, authorities seized a blue Honda motorcycle they say was purchased by Ms. Rohani in December and used by Mr. Sedaghatzadeh. It was found abandoned on a Bangkok street on Saturday.

The most damning evidence was found in the destroyed house: two more portable-radio bombs, each filled with one or two pounds of plastic explosives and ball-bearings.

The bombs had round, coin-like magnets on them, similar to the “sticky” bombs used against Israeli envoys in a foiled attack in Tbilisi, Georgia, on Feb. 13 and a blast in New Delhi the same day that injured four people, including a diplomat’s wife.

Thai officials say the Bangkok plot was aimed at Israeli diplomats, too. Israel has gone further, alleging the evidence clearly points to Iran as being behind all three plots.