At least 26 people were killed in Taiwan when a tourist bus rammed a guardrail and burst into flames Tuesday, state media reported.

The victims comprised 24 mainland Chinese tourists, as well as the Taiwanese driver and tour guide, the Central News Agency reported.

The cause of the accident was not yet known, the police said.

"Our video image shows that the tourist coach had caught fire before it rammed into the outside guardrail," Lu Rui-yao, a police officer with the National Highway Police Bureau, said in a news conference broadcast live nationwide.

The coach was not overloaded, a Taiwanese travel agent arranging the itinerary said in a television interview.

The tour group, which consisted of eight male and 16 female tourists, was about to fly back to China after wrapping up an eight-day trip in Taiwan. There were three teenagers in the group, the travel agent said.

Taiwan President Tsai Ing-wen expressed concern and ordered the government to offer assistance to victims' families, presidential office spokesman Alex Huang said.

Premier Lin Chuan expressed his condolences, demanding a full investigation. 

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