DURHAM, N.C. (AP) — The deep freeze that killed at least 15 people and shut down much of the South began to relent Thursday as crews worked to clear roads blanketed by a slow-moving storm that left ice and snow in places that usually enjoy mild winters. The snow stopped by early morning after the storm blew off shore, but North Carolina officials urged drivers to stay home while crews took their first crack at roads coated just hours earlier by the storm. Other parts of the South continued to struggle, including Louisiana, where interstate highways remained closed in the capital city Baton Rouge.