NEW BRUNSWICK, NJ - New Brunswick’s Civic Square, which houses the New Brunswick Police Department and several City and Middlesex County offices, was briefly evacuated Thursday afternoon following the discovery of a suspicious envelope in the Middlesex County Prosecutor’s Office mailroom on the third floor.

The building was safely evacuated after a county worker lost consciousness shortly after opening the envelope just after 2 p.m.

Officials turned off the HVAC system to eliminate the potential spread of any airborne agents.

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The envelope appeared to be empty and since it was sent to the Middlesex County Prosecutor’s Office through the U.S. Postal Service, the FBI is working to determine the exact contents, if any, according to a statement from a city spokesman.

The Middlesex County Hazardous Materials Unit declared the building safe to enter at about 3:30 p.m. and workers were allowed to return to their offices.

Kirkpatrick Street, which had been closed between Bayard and New Streets as a safety precaution, was also reopened to traffic.

The New Brunswick Police and Fire Departments as well as the New Brunswick Office of Emergency Management and the Middlesex County Hazardous Materials Unit all responded.

Anyone with additional information should contact the Middlesex County Prosecutor’s Office at 732-745-3300 or the New Brunswick Police Department at 732-745-5200.