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At least 21 people were killed in a bombing at the Erawan Shrine in central Bangkok Monday. Above, a woman places a bouquet of flowers near the shrine, Tuesday, Aug. 18, 2015. Reuters/Athit Perawongmetha

Thai police and investigators were slowly piecing together Tuesday the scattered aftermath of a deadly bombing at the Erawan Shrine in Bangkok. At least 21 people were reported killed and 123 wounded in the blast Monday.

Of the 20 victims, five were Thai, two were Malaysian, two were Chinese, two were from Hong Kong and one was Singaporean, while the identities and nationalities of the remaining eight were unknown, a government spokesman said Tuesday. Later, one victim was confirmed to be a British national. Chan "Vivian" Wang-Yang, 19, a Hong Kong resident, was a law student at the School of Oriental and African Studies at the University of London.

The university did not immediately confirm her death, but the school's Thai Society posted a statement to Facebook Tuesday sharing the news. Chan had a food blog and an accompanying Instagram account, the Thai Society said.

Chan had recently posted a colorful image of raw crab sashimi to her account. "Freshly caught meaty crabs on the day frozen JUST on point!" the caption read. "Definitely a must try when you come to Bangkok!"

A 24-year-old resident of Hong Kong, Arcadia Pang, was also killed. A Malaysian woman, Lim Saw Gek, and her son, Neoh Jai Jun, were among those killed in the blast, Malaysian authorities said, the BBC reported. The Singaporean citizen who was killed was said to have been 34-year-old Melisa Liu Rui Chun, and her husband was reportedly injured. From Indonesia, a woman named Lioe Lie Tjing was killed, and her husband was said to be in critical condition.

At least 120 people, including citizens of Taiwan, the Maldives, Oman, the Philippines, Malaysia and China, were estimated to have been wounded when an improvised explosive device made of TNT stuffed into a pipe went off at the Erawan Shrine, a popular destination for both locals and tourists in the center of Bangkok, at roughly 7 p.m. local time Monday.

Onlookers described body parts littering the area, along with shattered glass and burnt parts of vehicles. At least 12 people died at the scene.

It was unclear who carried out the bombing. Some have suggested Islamist separatists from southern Thailand were responsible, while the government blamed a rebel group in the northeast of the country. "None of the theories put forward are totally convincing on the scant information we have so far," Pavin Chachavalpongpun, an associate professor at Kyoto University's Center for Southeast Asian Studies, wrote for the BBC.