Looting, deadly prison riots and street chaos have engulfed Tunisia, a day after mass protests forced its long-time president, Zine El Abidine Ben Ali, to flee. A new interim president was sworn in on Saturday, promising to create a unity government that could include the long-ignored opposition. It was the second change of power in this North African nation in less than 24 hours. Amid the political instability, looters emptied shops and torched the main train station in the capital,