Thailand’s junta leader said Tuesday security forces had identified a suspect in an unprecedented Bangkok Bombing that targeted foreigners at a packed religious shrine, killing at least 21 people. Junta chief Prayut Chan-O-Cha on Tuesday branded the bombing “worst ever attack” on Thailand, as he gave the first indications of who authorities believed were responsible. “Today there is a suspect, we are looking for this guy,” Prayut told reporters, adding the man was seen on closed circuit television at the blast site. Prayut said the suspect was believed to be from an “anti-government group based in Thailand’s northeast”- the heartland of the kingdom’s Red Shirt movement that opposes the military junta. Bangkok has endured years of deadly political violence, with the junta ruling the nation since May last year after toppling the elected government of Yingluck Shinawatra. The Red Shirts are a grassroots network of rural and urban poor that are loyal to Yingluck and her self exiled brother, Thaksin Shinawatra, a populist politician, who was a previous prime minister. Prayut’s comments suggest the investigation is shifting towards groups loyal to the Shinawatras, rather than Muslim militants from the country’s far south where a deadly insurgency has raged for more than a decade. No one has claimed responsibility for the assault that left more than 100 people injured.