Pan American Energy LLC, the Argentine energy company partly owned by BP Plc, said that its Cerro Dragon oil field will stop supplying gas to two pipelines “within hours” after about 400 workers occupied the plant.

The construction workers were blocking roads to the plant as well as occupying the installations, PAE said in an e-mailed statement late yesterday.

To contact the reporter on this story: Matt Craze in Santiago at mcraze@bloomberg.net.

To contact the editor responsible for this story: James Attwood at jattwood3@bloomberg.net.