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Ottawa police, fire and paramedics responded to a call about an envelope on an OC Transpo bus at Elgin and Rideau streets on Saturday night.

A bus driver had found an envelope on his bus, kicked it and then started to feel nauseous, acting Staff Sgt. John Gibbons said as he arrived at the scene.

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When contacted, an Ottawa Paramedic Service spokesman referred to it as a hazmat call.

Four people had been quarantined, Gibbons said.

Elgin Street was closed between the National War Memorial and Queen Street.

A criminal investigation had been started, Gibbons said.

Photo by Keith Bonnell / Postmedia