More than 140 dead in Myanmar, state media saysEarthquake was of 7.7 magnitude, USGS reportsSkyscraper toppled in BangkokBuildings and bridges in Myanmar collapseA powerful earthquake centred in Myanmar rocked Southeast Asia on Friday, killing 144 people and injuring 732 in that country, according to state media, and toppling buildings across a wide area. Junta chief Min Aung Hlaing said the toll was "likely to rise".The quake also hit Thailand, where rescuers in the capital Bangkok were searching in the rubble of a tower block that had been under construction and collapsed. There were 117 people missing and five dead following the building collapse, according to the rescue operation.The United States Geological Survey (USGS) said the quake, which struck at lunchtime, was of 7.7 magnitude and at a depth of 10 km. The epicentre was about 17 km from Mandalay, Myanmar.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."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."Hundreds of casualties arrived at a major hospital in Naypyidaw where the emergency department entrance had collapsed on a car.A hospital official described it as a "mass casualty area" with medics treating the wounded outside."I haven't seen (something) like this before. We are trying to handle the situation. I'm so exhausted now," a doctor told AFP.As night fell, AFP journalists saw rescuers trying to extract a mother and son from the ruins of a collapsed building in Naypyidaw.Both were seriously injured but rescuers were unable to reach them, a Red Cross worker told AFP.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.The quake caused the collapse of buildings in five cities and towns, as well as a railway bridge and a road bridge on the Yangon-Mandalay Expressway, Myanmar state media said.Images showed the destroyed Ava Bridge over the Irrawaddy River, its arches leaning into the water.The quake will further stretch Myanmar's ruling military, which is fighting against an armed uprising. The junta declared a state of emergency in multiple regions but provided no specifics of damage."The state will make inquiries on the situation quickly and conduct rescue operations along with providing humanitarian aid," it said on Telegram.The Red Cross said roads, bridges and buildings had been damaged in Myanmar, and there were concerns for the state of large dams.Mandalay is Myanmar's ancient royal capital and at the centre of the country's Buddhist heartland.A Mandalay resident said destruction stretched across the whole city, and one neighbourhood, Sein Pan, was on fire.Roads were damaged, phone lines disrupted and there was no electricity, said the resident, who declined to be named.Local media outlet Myanmar Now posted images showing a clock tower had collapsed, and part of the wall by Mandalay Palace was in ruins.A witness, Htet Naing Oo, told Reuters that a tea shop had collapsed with several people trapped inside."We couldn't go in," she said. "The situation is very bad."At least three people died after a mosque in Taungoo partially collapsed, two witnesses said."We were saying prayers when the shaking started... Three died on the spot," one said.Local media reported a hotel in Aung Ban, in Shan state, crumbled into rubble, with the Democratic Voice of Burma reporting two people had died and 20 were trapped.Army-run MRTV reported that the quake toppled buildings, crushed cars and left huge fissures on roads across the capital Naypyitaw.Amnesty International said the earthquake could not have come at a worse time for Myanmar, given the number of displaced people, the existing need for relief aid, and cuts by the Trump administration to US aid.Restricted media access meant a clear picture of the extent of damage and loss might not emerge for some time, the group's Myanmar researcher, Joe Freeman, said.Nyi Nyi Kyaw, a Myanmar academic at the University of Bristol, said the earthquake had struck "at a moment when Myanmar is at its most vulnerable ... in decades".Civil society had largely fled following the coup and those community-based organisations that remained were unable to manage the disaster relief effort, he said."In essence, Myanmar is wholly unable to deal with the shock and its aftermath," he said.Across the border in Thailand, a 30-storey skyscraper under construction collapsed to a tangled heap of rubble and dust in a matter of seconds.Officials have said three workers are confirmed dead with dozens more still unaccounted for, many believed trapped in the rubble."I heard people calling for help, saying 'help me'," Worapat Sukthai, deputy police chief of Bang Sue district, told AFP.In the Thai capital, people ran out onto the streets in panic, many of them hotel guests in bathrobes and swimming costumes, as water cascaded down from an elevated pool at a luxury hotel, witnesses said.The Stock Exchange of Thailand suspended all trading activities for the Friday afternoon session.One office tower in downtown Bangkok swayed from side to side for at least two minutes, with doors and windows creaking loudly, witnesses said."At first, I didn't realise (it was an earthquake)," office worker Varunyou Armarttayakul told Reuters."But then I saw the table shaking, and the chair and computer started swaying, too...Part of the ceiling even collapsed - that's when I had to run out."As night fell, around 100 rescue workers assembled at the scene to search for survivors, illuminated by specially erected floodlights.Visiting the site, Prime Minister Paetongtarn Shinawatra said "every building" in Bangkok would need to be inspected for safety, though it was not immediately clear how that would be carried out.An emergency zone was declared in Bangkok, where some metro and light rail services were suspended.The streets of the capital were full of commuters attempting to walk home, or simply taking refuge in the entrances of malls and office buildings.China's Xinhua news agency said strong tremors were felt in southwestern Yunnan province, which borders Myanmar, but there were no reports of casualties.