Global intelligence firm STRATFOR has this report:
On Jan. 12, Thai authorities arrested a man they say was a member of the Lebanon-based Shiite militant group Hezbollah who was plotting an attack in Bangkok. In uncovering the plot, Thai police cite cooperation with the United States and Israel going back to December 2011. Bangkok is indeed a target-rich environment with a history of terrorist attacks, but today Hezbollah and other militant and criminal groups rely on the city as more of a business hub than anything else. If Hezbollah or some other transnational militant group were to carry out an attack in the city, it would have to be for a compelling reason that outweighed the costs.
(Emphasis mine.)