Colombia has ordered US-based coal producer Drummond to stop loading coal in Colombian ports until the company complies with new environmental rules.
Under the regulations, coal exporters will no longer be allowed to use barges and cranes to load ships.
The rules are aimed at preventing spillage and pollution of the seas.
Three weeks ago, Drummond was fined $3.5m (£2.1m) for spilling hundreds of tonnes of coal when it tried to rescue a sinking barge in January 2013.
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