But union leaders said employees had stopped work in some areas and production would fall by the evening. Earlier, ONGC Employees Association vice president Suryakant Shinde said workers at the Mumbai offshore fields were on strike over safety concerns after a helicopter ferrying oil workers crashed on Monday, killing at least 25 people.
ONGC produces 80 percent of India's crude oil output of 660,000 barrels per day. Its main fields off the coast of Mumbai produce two-thirds of its 520,000 bpd output.
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