At least four people are in hospital after a massive blast rocked a Lake County plant in the west of the Chicago suburb of Waukegan on Friday night, NBC reported on Saturday, citing officials.
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Two of the injured were sent to Advocate Condell Medical Center and the other two were taken to Vista Medical Center-East.
Waukegan Police Commander Joe Florip, cited by NBC Chicago, said that a search and rescue operation was underway to rescue other second-shift employees who may have been in the facility at the time of the incident.