TRIPOLI, Libya ? Militias apparently backing a renegade Libyan general attacked the country's parliament Sunday, kidnapping some 20 lawmakers and officials in an assault that threatened to further splinter a country dominated by the armed groups that overthrew dictator Moammar Gadhafi three years ago. A spokesman for the Gen. Khalifa Hifter, a one-time rebel commander who said the U.S. backed his efforts topple Gadhafi in the 1990s, said the forces acted under his command. Backed by truck-mounted anti-aircraft guns, mortars and rocket fire, the gunmen sent lawmakers fleeing for their lives as they ransacked the legislature. Heavy gunfire rang out into the night in Libya's capital, Tripoli,...