A powerful earthquake centred in Myanmar has rocked southeast Asia, killing more than 140 people in that country, according to state media, and toppling buildings across a wide area.
The quake also hit Thailand, where at least nine people were killed in the capital Bangkok.
Of the confirmed casualties, eight died when a building under construction collapsed, while the ninth person died in a different location, according to Bangkok's Deputy Governor.
There were over 110 people missing following the building collapse, according to the rescue operation.
Much of the destruction appeared to have taken place in Mandalay in Myanmar.
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The United States Geological Survey (USGS) said the quake, which struck at lunchtime local time, was of 7.7 magnitude and at a depth of 10km. The epicentre was about 17km from Mandalay.
The city, with a population of about 1.5 million, is Myanmar's ancient royal capital and the centre of its Buddhist heartland.
Buildings, bridges and roads were wrecked, residents and local media said.
State-run MRTV said on the Telegram messaging app that at least 144 people had been killed in Myanmar and 732 injured.
"We all ran out of the house as everything started shaking," a Mandalay resident told Reuters. "I witnessed a five-storey building collapse in front of my eyes. Everyone in my town is out on the road and no one dares to go back inside buildings."
A rescue worker from the Moe Saydanar charity group told Reuters that it had retrieved at least 60 bodies from monasteries and buildings in Pyinmanar, near Myanmar's capital Naypyidaw, and more people were trapped.
"This 60 is only from my charity group and only at Pyinmanar town," he said.
Myanmar's military junta is locked in a struggle to put down insurgents fighting its rule, a situation that is likely to complicate the rescue and relief operation.
Watch: Earthquake collapses skyscraper under construction in Bangkok
Across Bangkok and the northern tourist destination of Chiang Mai, where the power briefly went out, stunned residents hurried outside, unsure of how to respond to the unusual quake.
"I quickly rushed out of the shop along with other customers," said Sai, 76, who was working at a minimart in Chiang Mai when the shop started to shake.
"This is the strongest tremor I've experienced in my life."
Thai Prime Minister Paetongtarn Shinawatra declared a state of emergency in Bangkok, where some metro and light rail services were suspended, further snarling the city's already notorious traffic.
Airports were operating as normal.
The quake was felt across the region, with China, Cambodia, Bangladesh and India all reporting tremors.
A livestream broadcast by the state-linked Beijing News showed around a dozen emergency workers in orange jumpsuits and helmets on a street strewn with fallen masonry in the city of Ruili, on the Chinese border with Myanmar.
A shop worker interviewed on the livestream showed phone footage of people running out of stores with their hands over their heads as tremors swept through the street.
A video posted on Douyin, the Chinese version of TikTok, and geolocated by AFP showed a torrent of water and debris cascading from the roof of a high-rise block in Ruili as people fled through a street market below.
Earthquakes are relatively common in Myanmar, where six strong quakes of 7.0 magnitude or more struck between 1930 and 1956 near the Sagaing Fault, which runs north to south through the centre of the country, according to the USGS.
A powerful 6.8-magnitude earthquake in the ancient capital Bagan in central Myanmar killed three people in 2016, also toppling spires and crumbling temple walls at the tourist destination.
