Protesters challenge President Nicolas Maduro's re-election victory in Chacaito, a neighborhood in eastern Caracas, and clash with national security forces who fire tear gas and rubber bullets. The Venezuelan opposition claims candidate Edmundo Gonzalez Urrutia won the election, leading thousands of people to flood the streets of several neighborhoods in the capital, chanting "Freedom, freedom!" and "This government will fall!" IMAGES AND SOUNDBITES [TO COMPLETE 366Z743_EN, 366Z2W9_EN, 366C2VQ_EN, 366Z8V4_EN, 366M228_EN, 366Z9EZ_EN, 366Z2VX_EN]