Washington, D.C., Police Chief Robert Contee addresses reporters in January. The police department has acknowledged that its computer network has been breached by attackers seeking a ransom. Such attacks against local governments, hospitals and corporations have been rising sharply.

D.C. Police Chief Robert Contee addresses reporters as Mayor Muriel Bowser, District officials, and federal partners hold a public safety briefing, Friday, Jan. 15, 2021, on the preparations for the inauguration of President-elect Joe Biden in Washington. (Bill O’Leary/The Washington Post via AP, Pool)