Thailand: local "Red Shirt" group amongst prime suspects
Thailand is under military dictatorship and, whilst international terrorism has not been ruled out, the principal suspects are thought to be local Thai groups; either elements from the 'Red Shirt' opposition or from Muslim separatists from the country's south. &nbsp;Contrary to earlier reports of possible secondary devices, there was just one pipe bomb, placed under a bench within the shrine's grounds. &nbsp;The death toll currently stands at 22, with roughly 140 injured. &nbsp;The New York Times mentions a specific suspect as being a woman that spoke in Thai and left a package where the bomb exploded some fifteen minutes before the attack. Sky News quotes the Prime Minister as pointing the finger at an "anti-government group based in Thailand's northeast"; ie the Red Shirt opposition.
As of early Tuesday there was no claim of responsibility. Prayuth Chan-ocha, the head of Thailand’s military government, said that the authorities were searching for a person seen on closed-circuit footage but that it was not clear who the person was, news agencies reported.

A spokesman for the police, Lt. Gen. Prawut Thavornsiri, told a Thai television interviewer that “we haven’t concluded anything.” The authorities said they were reviewing footage from 15 security cameras in the area but that the rush-hour crowds made deciphering the video difficult.

“The shrine was very crowded,” General Prawut said. “It’s not clear even looking at the CCTV footage.”

The bomb, General Prawut said, was placed under a bench on the outer rim of the shrine’s grounds. Initially, the police said they had discovered at least two additional devices that they suspected were unexploded bombs inside the shrine and said other bombs may have been placed in the area, yelling at bystanders: “Get out! Get out!”