The FBI is concerned about the possibility of an organized attack in the United States similar to the one that killed scores at a Russian concert hall last month‚ the bureau';s director plans to tell a House of Representatives panel on Thursday.Looking back over my career in law enforcement‚ Id be hard pressed to think of a time where so many threats to our public safety and national security were so elevated all at once‚ Christopher Wray is set to tell lawmakers during a budget hearing...