Violence erupted for a second day Saturday in the Tunisian capital as police used tear gas on protesters demanding the prime minister's resignation. Young demonstrators hurled rocks at police officers and set several cars on fire, The Wall Street Journal reported. Gunfire was heard in central Tunis. About 100,000 people turned out Friday for the largest rally since President Zine El Abidine Ben Ali, Tunisia's longtime dictator, stepped down Jan. 14. The Interior Ministry said at least 20 police officers were hurt and demonstrators broke into stores.