SANTIAGO (Reuters) -All five trapped workers at Codelco's El Teniente copper mine have been found dead, a regional prosecutor said on Sunday, after rescue teams cleared more than two dozen meters (78 feet) of underground passages that collapsed in a strong tremor last week.

Codelco says four of the five workers trapped at its El Teniente mine have been pronounced dead, as rescue efforts continue following a powerful tremor that caused the mine to collapse last week.

All five workers trapped in a collapse at Chile's El Teniente mine were found dead, raising the death toll to six. Codelco will investigate the cause, with questions about natural or mining-related triggers.