Chinese electric carmaker Nio says that two people were killed when one of its vehicles fell from the third floor of its headquarters in Shanghai.
One member of staff and a person from a partner company died in the crash.
The incident took place on Wednesday at about 17:20 local time, the firm said. The people who died were inside the vehicle as it fell from the building.
Nio says it immediately started an investigation into the incident in co-operation with government officials.
The third storey area from where the car fell has been variously described as a showroom, a testing facility or a car park.
"Our company has collaborated with public security department to launch the investigation and analysis of the cause of the accident. Based on the analysis of the situation at the scene, we can initially confirm that this was an accident (not caused by the vehicle)," the company said in a statement.
"We feel very sad about this accident and would like to express our deepest condolences to our colleague and partner employee who lost their lives. A team has been set up to help the families," it added.
Terrible story of two test drivers at #China’s electrical vehicle manufacturer NIO being killed when a car somehow smashed out of a building and came crashing down from a great height. pic.twitter.com/4ZNI2t7LqZ— Stephen McDonell (@StephenMcDonell) June 23, 2022
Nio's initial statement on Weibo attracted more than 1,000 comments within half an hour, but was then taken down.
The last sentence of the statement "not related to the vehicle itself" triggered many angry responses from social media users.
One comment read "it shows the cold blood of capitalism", while another said, "the last sentence is so indifferent. They [test drivers] came to test the vehicle, but you say [the accident] has nothing to do with the vehicle?".
Yet another Weibo user said: "It should be public security bureau to confirm if it's an accident or not."
The car maker has since posted a revised version of the statement, which still refers to the crash as an accident but now has "not caused by the vehicle" in brackets apparently to de-emphasise that part of the sentence. All the comments to the new post are now "RIP".
Nio is at the forefront of China's homegrown drive to dominate the electric vehicle industry. It has staked a lot on interchangeable batteries in its cars as a way to overcome customer concerns about frequent charging.
The company is a rival to multi-billionaire Elon Musk's US-based electric car maker Tesla, which has a major manufacturing plant in Shanghai.
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