A Sterling man died Friday morning after suffering what authorities described as an “unknown medical emergency” while he was held at the Loudoun County Adult Detention Center, according to the Loudoun County Sheriff’s Office.

A correctional officer at the jail saw inmate Scott A. Landrum, 45, experiencing symptoms from an unknown medical condition about 6:30 a.m. during a routine check-in, according to Liz Mills, spokeswoman for the Loudoun County Sheriff’s Office. Mills declined to comment on the specific symptoms that the officer observed.

On-site medical staff were summoned to the cell, and Landrum was transported to the Cornwall Campus of Inova Loudoun Hospital, where he died, according to authorities.

Landrum had been taken into custody on Thursday after he violated a protective order filed against him the previous day, authorities said. He was booked into the Loudoun County Adult Detention Center about 1:34 p.m., according to the sheriff’s office. Mills did not comment on the details of the protective order filed against Landrum.

The cause and manner of Landrum’s death are currently under investigation by the Office of the Virginia Medical Examiner and the Loudoun County Sheriff’s Office, authorities said.