Anti-Maduro protests persist in Venezuela, with sit-ins and roadblocks

By Andrew CawthorneCARACAS (Reuters) - Opponents of President Nicolas Maduro staged sit-ins and roadblocks across Venezuela on Monday to press for elections, sparking new unrest.A local governor of the ruling Socialist Party who earlier said that a sniper had killed a policeman, later said that was not true and that the policeman was in critical condition.Demonstrators have been on the streets daily since early April to demand elections, freedom for jailed activists, foreign humanitarian aid to