A man wearing a large metal necklace was pulled into an MRI machine in New York.
The 61-year-old, who has not been named, was pulled by the machine's strong magnetic force after he entered a room at the Nassau Open MRI clinic while a scan was under way, Nassau County Police said.
It is unknown why the man entered the room or if he was a patient at the clinic.
Police added that the accident on Wednesday afternoon "resulted in a medical episode" and left the man in a critical condition in hospital.
There was no update on his condition on Friday.
MRI stands for Magnetic Resonance Imaging. The machines use strong magnetic fields and radio waves to create detailed images of the inside of the body.
Due to the magnetic fields, "very powerful forces" are exerted on objects made of iron, some steels, and other magnetic materials, the National Institute of Biomedical Imaging and Bioengineering says.
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It says the forces are "strong enough to fling a wheelchair across the room".
Sky News' US partner network NBC New York reported that MRI accidents are rare but can be fatal.
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