Fargo Public health and law enforcement officials are investigating an outbreak of illness that sickened more than 100 inmates at the Cass County Jail overnight Tuesday.

The first inmates started reporting mild symptoms like upset stomachs and diarrhea, said Cass County Sheriff’s Sgt. Tim Briggeman.

By 6 Tuesday morning, 110 of the jail’s 282 inmates had reported the same symptoms.

Jail staff treated all inmates on site, and none has reported their symptoms getting worse, Briggeman said.

The sheriff’s office has reported the outbreak to the North Dakota Department of Corrections, and is investigating the outbreak along with officials from Fargo Cass Public Health.