It began when three men blew up their house accidentally on Valentine's Day in Bangkok. It ended with a gory scene that looked more like Baghdad: A bloodied, would-be bomber with severed legs moaning on a glass-strewn sidewalk after another botched blast. Last week's explosions in the Thai capital announced the apparent arrival of international terrorists in this Southeast Asian nation, revealing a plot allegedly aimed against Israeli diplomats. But big questions remain about who was behind the plot, and why.

So far, three Iranian citizens have been detained in the case, though police say they haven't revealed anything substantial under interrogation. A Thai court issued an arrest warrant for an additional Iranian suspect this week, and on Tuesday, police were investigating the discovery of stickers plastered on Bangkok utility poles and billboards that may have marked routes for intended victims. Was it part of a covert tit-for-tat war in which Iranians are hitting back at Israel for allegedly killing Iranian nuclear scientists in Tehran? Were the assailants part of a global terror network? If they were professional assassins, why were they so inept?

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