A train carrying nearly 500 passengers collided and then derailed in a tunnel in Taiwan, killing at least 48 people and injuring hundreds more.
At the tunnel's mouth, the eight-car train allegedly collided with a construction truck that had fallen onto the tracks.
Within the tube, rescuers combed heavily burned carriages for survivors, some of whom broke windows to escape.
The train, which ran from Taipei to Taitung, was carrying passengers on their way to Taitung for a long weekend holiday.
Since the train was so crowded, many passengers would have been forced to stand.
The 408 train is one of the fastest on a network that is commonly regarded as stable. It has a top speed of 130 km/h(80mph).
Friday's crash is Taiwan's worst rail disaster in decades. President Tsai Ing-wen has sent her condolences to the families of the victims and ordered an investigation.
Any passengers in the back of the train remained unharmed, while 100 people were evacuated from the first four carriages. Many of the killed, wounded, and stranded were found inside the tunnel in four crumpled carriages.
One female survivor told Taiwan's UDN, "It felt like there was a sudden violent jolt and I found myself crashing to the floor." "To get out, we broke the glass and scrambled to the train's roof."
Another woman who had been saved said: "My whole body was thrown to the ground. When I hit my head, it began to bleed."
The accident occurred at 09:00 a.m. local time (01:00 GMT).
According to news in the local media, the train driver is among the killed.
A big yellow flatbed truck can be seen parked along the tracks. A development scheme is ongoing at the tunnel's northern end.
The vehicle's descent down the embankment is unclear.
Premier Su Tseng-chang of Taiwan paid a visit to the crash site on Friday afternoon.
"I give my heartfelt condolences to all those affected by this morning's rail crash in Taiwan," UK Foreign Secretary Dominic Raab said on Twitter.
People were seen walking along the tracks with their belongings as they were rescued from less severely damaged carriages, according to photos posted on the internet. Other survivors were carried out on stretchers with braces around their heads.
The Tomb Sweeping festival is a day when people pay their respects to the deceased by visiting the graves of friends and families, sprucing them up, and giving offerings to their spirits. All of those on the train are thought to have been on their way to commemorate the festival.
The most recent big train derailment in Taiwan occurred in 2018, killing 18 passengers.
The island's deadliest collision in recent memory occurred in 1991, when two trains crashed, killing 30 people and injuring 112 others.