The strike over French labour laws has become more entrenched, amid union claims that all of the country’s oil refineries have been affected by blockades.
French oil and gas company Total says it will “seriously consider” its investment plans in France because of the disruption, iTele television reported the group’s chief executive as saying.
The government has warned that the action won’t be tolerated and that sites will be liberated.
Riot police moved in before dawn to break up a strike picket at Fos-sur-Mer near Marseille, where access had been denied to an Esso refinery and fuel depot.
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