‘Super fog’ near New Orleans blamed for crashes that killed at least seven

An estimated 158 vehicles were involved (Gerald Herbert/AP)

At least seven people have been killed after a “super fog” of smoke from marsh fires and dense morning fog caused a series of crashes near New Orleans in the US that left a long stretch of mangled and scorched vehicles.

An estimated 158 vehicles were involved and 25 people were injured in the incident on Interstate 55, according to the Louisiana State Police.