Jacques Moretti and his wife Jessica, co-owners of a Swiss bar where 40 people died in a fire on New Year's Eve, have been detained and remanded in custody, police sources told local media.
A fire at the Le Constellation cafe in Crans-Montana injured 116 people, many of whom were under the age of 20.
Among the dead was Stefan Ivanović, a Serbian citizen who worked as a security guard at the bar.
Earlier this week, media reported that a catering facility in a famous ski resort had failed to pass safety inspections for five years.
Swiss prosecutors have launched an investigation against Jacques Moretti and his wife, a French citizen, Jessica.
As co-owners of the bar, both are suspected of manslaughter, bodily harm and negligent arson, the Vale prosecutor's office said.
Prosecutors said they believe the fire started when people during a New Year's Eve celebration lifted champagne bottles with sprinklers attached, which ignited the insulating foam on the bar's ceiling.
On Friday, a minute of silence was held across Switzerland to honor the victims.
The church bells then rang for five minutes.
Trains and trams stopped, and Zurich airport briefly suspended operations.
In Crans-Montana, local firefighters were greeted with a standing ovation.
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