• At the time, Reuters reported a judge had ruled that Facebook Messenger operated using internet infrastructure, meaning no law required it to help the police. Products operating over telephone infrastructure do have to help the police secure wiretaps.

Two civil rights groups sued to see documents in the case, arguing that the documents would provide insight into the current state of internet communications law.

• O'Neill ruled that the documents revealed too much about investigation sources and methods and could not be reasonably redacted.

What they're saying:

• "FBI offices … are having investigations stalled, to include delayed forensic interviews of child victims and delaying grand jury indictments on homicides and child sexual assault prosecutions."
• "We have lost several sources who have worked for months, and years, to penetrate groups and target subjects."
• The central region is operating a long-term MS-13 investigation without a translator. "We have indicted 23 MS-13 gang members. … Since the shutdown, I have not had a Spanish speaker in the Division."
• "Our mechanics are cannibalizing out of service vehicles in an effort to replace flat tires."

Go deeper: All the ways Americans are feeling the effects of the shutdown