Felonious Assaults. In 2012 law enforcement agencies reported 52,901 officers assaulted in the line of duty. This number is low because only 64 percent of the agencies providing UCR data to the FBI actually submit assault data for law enforcement officers. However, from the data the FBI received, 10 percent of law enforcement officers were assaulted in the line of duty, and 28 percent of these assaults resulted in injuries.