WESTPORT — Squad cars with lights flashing blocked off the streets in the area of Bridgewater Assocates’ headquarters as dozens of vehicles left the facility after a bomb threat Wednesday afternoon.

Police evacuated the world’s largest hedge fund on Oct. 12 after reports of a threat at its 1 Glendinning Place facility around 3 p.m. In the late afternoon and early evening an officer worked alongside Bridgewater Security to direct traffic out onto Weston Road. Shortly after 5 p.m. a firetruck and ambulance left the scene.

Everyone was evacuated from the building safely, Lt. David Farrell confirmed. Westport detectives and the FBI are continuing to investigate the threat.

Stamford Police and Connecticut State Police bomb squads searched the building Wednesday and found no evidence of a bomb, according to Westport Police.

Westport Fire Chief Andrew Kingsbury said the department’s response was precautionary and firefighters stood by until they were told they could clear sometime between 5 and 6 p.m.

Police were also at two other Bridgewater locations in Westport, on Nyala Farms Road and Riverside Avenue. At the Nyala Farms Road facility just before 4 p.m., employees were standing and sitting in groups on the grass near the front gate.

Just before 7:30 p.m. Wednesday, Farrell said the decision was up to Bridgewater management whether they would reopen their Glendinning Place facility.

FBI New Haven Community Outreach Specialist Charles Grady did not return calls for comment by press time. The Stamford Bomb Squad could also not be reached for comment. State Police referred comment to Westport Police since their unit was on site to assist the department.

Lweiss@hearstmediact.com; @LauraEWeiss16