Paul Abbate, executive assistant director of the Federal Bureau of Investigation (FBI) criminal, cyber, response and services branch, right, speaks as Mary McCord, acting U.S. assistant attorney general for national security, center, and Brian Stretch, U.S. attorney for the northern district of California, listen during a news conference at the Department of Justice in Washington, D.C., U.S., on Wednesday, March 15, 2017. The U.S. charged four people, including two Russian intelligence officers, over the theft of hundreds of millions of accounts of Yahoo Inc. users from a computer breach that threatened to derail its acquisition by Verizon Communications Inc. Photographer: Andrew Harrer/Bloomberg via Getty Images