Shell and third-party providers did not initially detect elevated levels of chemical emissions from the overnight fire.

Fire burning at Shell Norco, emergency crews on-site.

Crews continue fighting blaze sparked by hydrogen and gas leak late Monday night ...

Shell said Tuesday morning that it has put out an overnight fire that broke out at one of the processing units at its 250,000 b/d Norco refinery in St. Charles Parish, Louisiana. In a 9 a.m. CT update ...