Hours after crews were first called to a Syncrude worksite Tuesday afternoon, the company said emergency personnel had isolated and contained the blaze.

In an update released late Tuesday evening, the company said crews with Syncrude Emergency Services and Operations had isolated and controlled the fire.

Earlier in the day, Syncrude had said the fire started at about 1:50 p.m. Tuesday.

RCMP said police and emergency crews were also called to the scene – saying there was an explosion at the facility, the Mildred Lake Upgrader, located north of Fort McMurray, between that city and Fort McKay.

For a few hours in the afternoon, RCMP shut down one lane on a section of Highway 63 near the site, to allow for the evacuation of workers on the site.

Alberta Health Services confirmed an individual had been taken to the Northern Lights Regional Health Centre in Fort McMurray, that individual was in serious but stable condition.

Syncrude confirmed the family of the injured person had been notified – and the company was supporting the family.

In addition, non-essential employees and contractors had been removed from the area, and appropriate regulators had been notified.

The blaze prompted an air quality information alert for residents in the Fort McKay area – that the fire was reducing air quality in the area, which could impact health and visibility.

The alert advised residents to stay indoors, and keep doors and windows closed – anyone suffering from chronic lung conditions should have enough medication for two days.