Thailand's Prime Minister has said authorities are looking for a "suspect" seen in CCTV footage at the site of a bomb attack that killed at least 22 people in Bangkok yesterday.
Officials have not blamed any group for the bombing at the Erawan shrine, which the government said was an attack to destroy the economy. No one has claimed responsibility.
Three Chinese were among the dead, China's official Xinhua news agency said.
Two Hong Kong residents, two people from Malaysia and one person from the Philippines also died, officials said.
British national Vivian Chan, who was studying law at the School of Oriental and African Studies in London, is believed to have been travelling with a friend who was also killed in the blast.
Prime Minister David Cameron said he was "deeply saddened" by the death of a British national in the bombing.
Deeply saddened to hear a British national was killed in the horrific Bangkok bombing. My thoughts are with her family & all those affected.
— David Cameron (@David_Cameron) August 18, 2015
Scores of people were wounded, including many from China and Taiwan.
The man suspected of the bombing seen in grainy CCTV footage entering the compound with a backpack on, sitting down against a railing and then slipping out of the bag's straps.
Wearing a yellow shirt and with shaggy, dark hair, the young man then stands up and walks out holding a blue plastic bag and what appears to be a mobile phone. The backpack was left by the fence as tourists milled about.
National police chief Somyot Pumpanmuang said the suspect could be Thai or foreign.
Prime Minister General Prayuth Chan-ocha told reporters there were "still anti-government groups out there" but gave no further details.
General Prayuth said the attack, which took place during rush hour in the capital's bustling commercial hub, was unprecedented in Thailand.
Thailand has been riven for a decade by a sometimes violent struggle for power between political factions in Bangkok.
Occasional small blasts have been blamed on one side or the other. Two pipe bombs exploded outside a luxury shopping mall in the same area in February, but caused little damage.
Thai forces are also fighting a low-level Muslim insurgency in the predominantly Buddhist country's south, but those rebels have rarely launched attacks outside their heartland.
The Erawan shrine, on a busy corner near top hotels, shopping centres, offices and a hospital, is a major attraction, especially for visitors from East Asia, including China. Many Thais also worship there.
Tourism is one of the few bright spots in an economy that continues to under perform more than a year after the military seized power in May 2014.
It accounts for about 10% of the economy, and the government had expected a record number of visitors this year following a sharp fall in 2014 during months of street protests and the coup.
