Thai police said Tuesday they are hunting for a suspect seen in CCTV footage who they believe may be connected to the bombing, which ripped through crowds gathered near the Erawan Shrine on Monday evening.
In one CCTV image released by police, the man is seen carrying a dark-colored backpack near the shrine. In another, he no longer has the backpack. He's wearing a yellow T-shirt and dark-framed glasses.
Royal Thai Police Commissioner Gen. Somyot Poompanmoung said authorities don't yet know the suspect's identity or whether he is a Thai citizen or a foreigner.
"We need more evidence before we can make any conclusions," he told reporters at a news conference, saying that police were studying more than 10 days' worth of CCTV footage from the area.
The shrine, situated at a bustling intersection near a large shopping mall, is a big draw for tourists. At least seven people from other Asian countries were reported to be among the dead. The site is popular among Buddhists, as well as Hindu and Sikh members of Thailand's Indian community.
"From this incident, it is apparent that there are active individuals or groups that harbor the intention to damage Thailand, who may be pursuing political gain or other intentions by damaging the economy and tourism," Prime Minister Prayuth Chan-ocha said.
The devastating blast struck around 7 p.m. Monday during a busy time in the area, sending a giant plume of smoke and flames into the air.
'So many bones were broken;
"It was like this huge gust of wind and debris flying through you," recalled Sanjeev Vyas, a DJ from Mumbai, India, who was in the middle of the fray. "And then I see bodies everywhere, there are cars on fire, there are bikes everywhere. People are screaming."
Marko Cunningham, a paramedic for Bangkok Free Ambulance who arrived at the site soon after the explosion went off, said the scene was "absolutely horrific."
"I've seen a lot, but I've never seen injuries as vicious as these injuries," he told CNN, adding that "so many bones were broken."
Police spokesman Lt. Gen. Prawut Thavornsiri said the attack had killed at least 22 people. About 120 others are reported to have been wounded.
There has so far been no claim of responsibility for the attack. Thai authorities haven't made any announcements about who they believe might be behind it.
Somyot, the police chief, said cryptically on state-run TV that authorities had been warned about possible attacks, but they didn't know where or when they might occur.
Adding to the jitters, a new explosion was heard Tuesday at a pier on the Chao Praya River that flows through Bangkok, police told CNN. No injuries have been reported, and the pier has been closed, said Prawut, the police spokesman.
It was unclear whether the two blasts were connected in any way.
Scale of attack shocks observers
Analysts say it's unclear which group would want to carry out the shrine attack, which is likely to hurt Thailand's tourism industry, a key part of the economy.