Flight LH452 touched down shortly before 2 p.m. Friday afternoon after reports of passengers feeling ill.
CTV Regina is reporting that a employee with Compass Group has been caught having sex with an inmate in a walk-in cooler at the Regina Correctional Centre.
The workers, including 6,000 jail guards and probation officers, had threatened to go on strike on Sunday if a deal had not been reached.
Air Canada said the pilot of Flight 623 reported an "acrid odour" shortly after takeoff from Halifax and returned as a precaution.
Hopes for a reprieve on North American stock markets were dashed Friday in another dismal session that capped off a turbulent start to the year.
The attack happened outside the Muslim Association of Canada Centre during a "welcome night" event for newly arrived Syrian refugees.