Gunmen open fire on Mexico Army chopper as violence roils major state

By Jose Luis Osorio GUADALAJARA, Mexico (Reuters) - Armed men attacked a Mexican army helicopter on Friday, killing three on board and forcing it to the ground on a day of violence that left at least seven people dead and vehicles, banks and gas stations ablaze. Security in Jalisco state, one of the growth engines of the Mexican economy, has become an increasing problem for President Enrique Pena Nieto, who took office pledging to pacify the country following years of brutal drug gang violence.