Workers to protest looming layoffs by the company.
Some 68 workers have resigned from their posts because of salary related demands.
Firm let go to one of the members of its supervisory board.
Workers say they have not been paid for the past three weeks.
A dozen people were injured in the incident.
Al Ahsa unit reported conveyor belt fire.
Isidoro Miranda has been appointed to the post.
Ralph Quellmalz has been appointed to the post.
Tribal gunmen reportedly kidnapped experts on Monday evening.
Fire at Leube unit was because of stored coal fuel.
Workers seeking higher wages, better benefits.
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