Witnesses say there was an explosion at an oil refinery in Saint John, N.B., this morning.
Irving said on Twitter that the company is "actively assessing the situation" and will share more information when it becomes available. Several streets have been closed down.
Nearby resident Bob McVicar posted on Facebook saying that it felt like a "bed-shaking explosion".
Tom Kloza, global head of energy analysis at Oil Price Information Service told CNBC 'We probably import more gasoline from that single refinery than any other single refinery around the world, ' he said. "Praying for the safety of all involved".
The refinery is near several residential neighbourhoods, and is about five kilometres from the city core, known as Uptown.
A massive oil refinery blast shook this historic port city Monday, sending flames and black smoke high into the sky but causing only four minor injuries - and leaving officials relieved it wasn't far worse.
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He said he and others saw a "very large black sooty plume of smoke" from their street.
"I heard a rumbling, roaring sound", Guimond said.
"I've lived in Saint John for 30 years and this is the first time I've seen something like this happen here". "At times we were letting that just safely extinguish itself", he said.
Residents that live near the refinery reported that they felt their houses shaking; not like an quake, but as if "a truck had driven into the house", resident Heather Adams told The Globe and Mail.
Michael Steeves said he was driving about a kilometre away when he saw flames reach as high as 100 feet in the air.
When CBC News asked New Brunswick's Horizon Health Network whether any injuries have been reported, a spokesperson responded they are working on getting a response.