'Super fog' in Louisiana leads to deadly crashes along I-55 near New Orleans

At least two people are dead and 30 are injured after "super fog" caused pileups on a stretch of Interstate 55 in Louisiana.

The fatalities and injuries resulted from about 25 different vehicle crashes Monday along I-55 west of New Orleans between Ruddock and Manchac, St. John the Baptist Parish Sheriff Mike Tregre told CNN affiliate WVUE. The stretch of highway runs between Lake Maurepas and Lake Pontchartrain.

Tregre said two fatalities were confirmed as of Monday afternoon.

In the northbound lanes, about three 18-wheel trucks collided and were fully engulfed in flames, Tregre told WVUE. In the southbound lanes, there were two reported multi-car pileups, one of which was also producing flames.

Tregre said one vehicle was pushed over the railing of the interstate, but those inside "appear to be fine."

According to Tregre, all first responders are on foot because the crashes have left the area "completely gridlocked." He said rescue efforts "will take a while."

"The situation is pretty bad," he added.