Tuesday, April 15th 2014, 10:31 am
The thick black smoke over west Tulsa is the result of a training exercise at HollyFrontier Refinery. The training exercise was planned in advance and was not caused by any emergency.
The smoke became visible in the skyline shortly after 9 a.m. and again just before 10 a.m.
HollyFrontier Refining Corporation is located at 1700 South Union Avenue. The switchboard confirmed that the smoke is part of the company's training process.
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