Rescuers have been combing the rubble of collapsed buildings in a search for about 60 people missing after a strong earthquake killed at least six near Taiwan's popular tourist city of Hualien.
The magnitude 6.4 quake, which hit near the coastal city just before midnight on Tuesday, also injured 258 people and collapsed four buildings, officials said.
Hualien Mayor Fu Kun-chi said the number of people missing was now close to 60, although an exact figure was not provided.
Many of the missing were believed to be still trapped inside buildings, some of which were tilting precariously, after the quake hit about 22km northeast of Hualien on Taiwan's east coast.
At the city's Marshal Hotel, rescuers trying to free two trapped Taiwanese pulled out one alive, but the other person was declared dead, the government said.
Among the injured were mainland Chinese, Czech, Japanese, Singaporean and South Korean nationals.
"This is the worst earthquake in the history of Hualien, or at least over the past 40 years that I've been alive," said volunteer Yang Hsi Hua.
"We've never had anything like this, we've never had a building topple over. Also, it was constantly shaking, so everyone was really scared, we ran to empty open spaces to avoid it."
Aftershocks with a magnitude of at least 5.0 could rock the island in the next two weeks, the government said. Smaller tremors rattled nervous residents throughout the day.
Hualien is home to about 100,000 people. Its streets were buckled by the force of the quake, with around 40,000 homes left without water and around 1900 without power.
Residents spoke of the panic when the earthquake struck.
"We were still open when it happened," said Lin Ching-wen, who operates a restaurant near a damaged military hospital.
"I grabbed my wife and children and we ran out and tried to rescue people," he said.
A Reuters video showed large cracks in the road, while police and emergency services tried to help anxious people roaming the streets.
President Tsai Ing-wen went to the scene of the quake early on Wednesday to help direct rescue operations.
"The president has asked the cabinet and related ministries to immediately launch the 'disaster mechanism' and to work at the fastest rate on disaster relief work," Tsai's office said in a statement.
Taiwan Semiconductor Manufacturing Co, the world's largest contract chipmaker and major Apple supplier, said initial assessments indicated no impact from the earthquake.
Taiwan, a self-ruled island that China considers part of its territory, lies near the junction of two tectonic plates and is prone to earthquakes.