(ROUGH CUT - NO REPORTER NARRATION)<br/> STORY: At least five people were killed and more than 25 injured Wednesday in a massive 51-car pile-up on a stretch of highway outside Santiago.<br/> Authorities said those figures could rise as rescue workers continued to pull injured and trapped motorists from their vehicles.<br/> Cleaning up the mess and assessing all the damages may take some time due to the magnitude of the incident.<br/> Rescue teams initially reported three deaths on the scene but at least one more died later at a nearby hospital due to injuries sustained in the accident. It was not clear if the fifth confirmed fatal victim died at the scene or in hospital.<br/> At least 25 injured passengers and drivers have been rushed to local hospitals as rescue crew continued to pry survivors from the wreckage.<br/> Police were investigating the cause of the accident which witnesses attributed to heavy morning fog and thick smoke possibly from nearby vineyards burning fires to protect their vines from frost.<br/> The colossal pile-up left traffic on both sides of the stretch between Valparaiso and Santiago backed up for kilometers (miles) in an immense traffic jam.
