Investigators have cleared the scene and traffic is once again flowing in the area of a downtown Vancouver building where six people experienced nausea after a suspicious envelope was discovered earlier Friday.

Vancouver Fire and Rescue tweeted that crews had left the scene and returned to quarters, and that the envelope was to be handed over to Health Canada for testing, though hazmat crews had found no evidence of dangerous materials in the envelope.

The envelope in question from Hazmat on Burrard Street will be in Health Canada's control for further testing. — Vancouver Fire (@VanFireRescue) March 13, 2015

Six people were earlier quarantined and assessed by paramedics after exhibiting symptoms of nausea.

The suspicious package was found on the 25th floor of a building on Burrard Street.

Hazmat teams arrived on scene at around 11 a.m. in response to reports of a package emitting a “strange smell.”

Earlier, Capt. Carol Messenger of Vancouver Fire and Rescue said police had shut down the street for an investigation that was expected to take several hours. However, Messenger said police did not believe there was a threat to people in the area, rather the streets were blocked off in order to give emergency response crews room to work.

"That was more for our fire crew's safety -- not to alarm or cause any sort of panic about something in the air. That was really for our safety and we want people to remain calm and stay where they are for the moment," Messenger said.

The building is located on Burrard Street, between Dunsmuir Street and Pender Street.