OCEAN ISLE BEACH, N.C. (AP) — A winter storm that left millions without power in record-breaking cold weather has claimed more lives. They include three people found dead after a tornado hit a seaside town in North Carolina and four family members who perished in a Houston-area house fire while using a fireplace to stay warm. The storm that overwhelmed power grids and immobilized the Southern Plains carried heavy snow and freezing rain into New England and the Deep South and left behind painfully low temperatures. Wind-chill warnings extended Tuesday from Canada into Mexico. In all, at least 20 deaths were reported.