Exxon Mobil Corp on Friday reported a process unit upset led to the evacuation of non-essential personnel from the process block at it 238,600 barrel-per-day Joliet, Illinois refinery.

The incident on Thursday resulted in excessive hydrogen cyanide emissions, Exxon said in a filing with the Illinois Emergency Management Agency.

"No onsite personnel have been evacuated," the filing said.

Copyright Reuters, 2019

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