BRENDAN O'BRIEN and LUCIA MUTIKANI AT least 23 people were killed and dozens injured after thunderstorms spawning high straight-line winds and tornados ripped across Mississippi late on Friday, leaving hundreds without shelter, state officials said on Saturday. Four people were missing following the storms, which left a trail of damage for more than 100 miles (161 km). The tornados struck Silver City, a town of 200 people in western Mississippi, as well as Rolling Fork, with a population of 1,700, which was hardest hit. Parts of the state remain under tornado warnings. "At least twenty-three Mississippians were killed by last…