About 70 percent of the cameras hooked up to the police’s closed-circuit TV (CCTV) system in Washington, D.C., were reportedly unable to record footage for several days before President Trump’s inauguration due to a ransomware attack.

The attack affected 123 of the 187 network video recorders that form the city’s CCTV system, the Washington Post reported Saturday. Each of these devices is used to store video footage captured by up to four cameras installed in public spaces.