"While cybersecurity becomes more important for law enforcement organizations across the country, one specific threat--the data¬-sabotage attack--should be prioritized above all others. Recently, several local agencies experienced one type of assault known as 'ransomware.' In these attacks, cybercriminals lock agencies' files and other types of data behind almost unbreakable walls of encryption, rendering them entirely inaccessible and unusable. Recent strikes targeted police and sheriff's departments in Massachusetts, Maine, Illinois, and Tennessee. In all of these incidents, the criminals had financial motivations-- the targeted agencies paid ransoms to the perpetrators, and the files were decrypted."
FBI Law Enforcement Bulletin: https://leb.fbi.gov/