KINSHASA, March 22 (Reuters) - U.N. peacekeepers in Congo evacuated more than 450 civilians from part of the capital Kinshasa on Thursday after gunbattles between a former rebel faction and government troops, a senior U.N. official said. "So far we have evacuated 450 people," the official from the U.N. mission in Congo (MONUC) told Reuters, asking not to be named. The civilians -- some of them injured -- were taken in armoured personnel carriers to MONUC's headquarters in Kinshasa. Gunfire and explosions rang out for much of the day as armed followers of former rebel leader Jean-Pierre Bemba battled government...