WASHINGTON Four law enforcement officers were killed and four others were wounded Monday in a shooting while serving a warrant at a home in Charlotte, North Carolina, police said. The suspect, who opened fire on officers with a high-powered rifle as they arrived at the residence, was himself fatally shot during the gunfight, said the Charlotte-Mecklenburg Police Department. "The heroic actions of these officers are a testament to the dangers our law enforcement officers face daily. Today, some