Thailand's junta leader says a suspect has been identified in the bombing at a Bangkok religious shrine that killed at least 20 people.  The attack occurred on Monday in one of the Thai capital's most popular tourism hubs, ripping through a crowd of worshippers at the Hindu shrine close to five-star hotels and upscale shopping malls.  Chinese, Hong Kong, Singaporean, Indonesian and Malaysian citizens were among the 20 people killed, police said.  More than 100 other people were injured as the blast left body parts strewn across crushed pavement, alongside shattered windows and incinerated motorcycles.  Prime Minister Prayut Chan-ocha on Tuesday gave the first indications who authorities believed was responsible, condemning the bombing as the "worst ever attack" on the kingdom.  "Today there is a suspect ... we are looking for this guy," Prayut said, adding the man was seen on closed circuit television at the blast site.  He also said he believed Facebook messages apparently warning of an imminent danger to Bangkok ahead of the bomb came from an "anti-government group" based in Thailand's northeast, the heartland of the kingdom's anti-coup Red Shirt movement.  "We are looking for them now, some of them are in Isaan (northeastern Thailand)," Prayut said.  Bangkok has endured more than a decade 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, who was a previous prime minister.  But no one claimed responsibility for the assault and security analysts expressed scepticism over the government's lightning move to cast suspicion on its opponents.  "Even if they (Red Shirts) are hell bent on bringing down the government, I just can't see them targeting a Hindu or any other religious shrine," said Zachary Abuza, an independent expert on Thai security.  "That would really alienate many of their supporters."  Muslim rebels from the country's far south have also waged a separatist insurgency for more than a decade that has claimed thousands of lives, mostly civilians.  But they have never been known to carry out substantial attacks in Bangkok.  Paul Chambers, director of research at the Institute of South East Asian Affairs in Thailand, said groups with links to military factions also had to be considered as potential suspects.  Junta leaders said the bomb was aimed at damaging the country's tourist industry, which is a rare bright spot in an otherwise gloomy economy, and tarnishing the junta's reputation.  "(The attackers) had the clear target of destroying our economy and tourism .... and discrediting the government," Defence Minister Prawit Wongsuwon told reporters.  Thailand's baht currency slumped to a more than six-year low on Tuesday and shares fell in Bangkok over concerns the attack could damage the tourism sector.  Police have tightened security across Bangkok, with hundreds of schools closed and checkpoints thrown up across the city.  The bomb was detonated shortly before 7.00pm local time in the middle of the city's rush hour, sending a fireball into the sky as commuters and tourists fled in panic.  Thais expressed fear about more potential violence in the coming days.  "I'm worried about Bangkok, I don't know what will happen next," one woman, who only gave her name as Rivewan, said.  Around 1000 people queued for hours at a nearby blood donation centre, many crying as they waited to be seen by nurses.  "This shouldn't have happened to the Thai people," Pongchai Kulsitthiwong, a 45-year-old mobile phone seller told AFP, tears rolling down his cheeks while waiting to give blood.  Bangkok's power struggle has seen repeated rounds of deadly street protests and bombings for nearly a decade.  But none on Monday's scale.  Do you have any news photos or videos?
A Bangkok shrine packed with worshippers and tourists has been hit by a bomb, leaving at least 10 people dead.