A large fog bank that engulfed a highway caused a pileup of at least 158 ​​vehicles with a death toll of seven in the southern US state of Louisiana, authorities said on Monday.

The so-called “super fog,” which U.S. media reported was caused by a combination of fire smoke and dense fog, caused massive congestion on Interstate 55 about 30 miles (48 kilometers) from New Orleans, New Orleans State Police said. .

Photos released by police showed both lanes of a highway bridge where the accident occurred blocked by crashed vehicles, including dozens burned.

According to police, a fire broke out on the highway.

More than 25 people were taken to hospital, apart from “many victims (who) sought medical help themselves.”