Multiple people were detained and a criminal case has been opened in northern Switzerland after a person died by assisted suicide Monday, according to police.

Swiss authorities have arrested several people and opened a criminal investigation after a 64-year-old American woman reportedly used a so-called “suicide pod” to end her life, according to local reports.

The "Sarco" capsule is designed to allow a person sitting inside to push a button that injects nitrogen gas into the sealed chamber.