02:53 - Source: CNN Quito, Ecuador CNN — Six suspects arrested in connection with the assassination of Ecuadorian presidential candidate Fernando Villavicencio are Colombian nationals and gang members, authorities have confirmed, as a former vice president demanded action over spiraling levels of violence in the South American country. Villavicencio, an anti-corruption campaigner and lawmaker who was outspoken about the violence caused by drug trafficking in the country, was shot dead at a campaign rally in the capital Quito on Wednesday. The killing of the 59-year-old came 10 days before the first round of the presidential election was set to take...