The largest workers union at the Colombian coal mine Cerrejon walked out on strike on Monday, the group said, after its members voted overwhelmingly to support the move following a collapse in contract negotiations.

Some 99% of members of the Sintracarbon union who voted on possible strike action earlier this month backed the walkout over arbitration.

"Despite the union’s efforts to reach a negotiated agreement, we have determined to start the strike today from 03:15 in the afternoon," the union said in a statement.

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