A spate of shooting attacks on law enforcement officers has authorities concerned about a war on cops. In just 24 hours, at least 11 officers were shot. The shootings included Sunday attacks at traffic stops in Indiana and Oregon, a Detroit police station shooting that wounded four officers, and a shootout at a Port Orchard, Wash., Wal-Mart that injured two deputies. On Monday morning, two officers were shot dead and a U.S. Marshal was wounded by a gunman in St. Petersburg, Fla. On Thursday, two