About 150 employees were evacuated from the Navy Exchange Service Command distribution center on Wednesday after an employee had an allergic reaction to an unknown chemical substance.

Suffolk Fire and Rescue and Suffolk Police responded to the building off Kenyon Road at 11:52 a.m. after a male employee encountered an “unknown chemical substance” at the base of a pallet after removing boxes inside the warehouse, according to a city news release. His hands experienced an allergic reaction, and he was taken to Sentara Obici Hospital for treatment.

The State Regional Hazmat Officer, the Regional Hazmat Team, hazardous materials teams from Chesapeake and Portsmouth and the FBI all responded to the scene, as well as several Suffolk Fire and Rescue units.

The preliminary results of the field test ruled out potential terrorist activity as well as other substances for which they typically test, the news release said.

A sample of the substance was sent to Richmond for more testing. The building remained closed for the rest of the day, and it is set to re-open Thursday following additional testing.

The Suffolk Fire Marshal’s Office is handling the investigation.