An employee on a pump station heard what was described as a mechanical bang early Tuesday morning, an official told CBS News.

LNG Canada has started to cool down its liquefied natural gas plant in Kitimat, British Columbia, considered a final step before it begins to produce the superchilled gas, two people told Reuters.

The Keystone oil pipeline was shut down Tuesday morning after a rupture in North Dakota halted the flow from Canada to U.S.