"The day the TDC team set up in Plesner’s offices, the law firm’s IT systems came under a denial-of-service hacking attack."
"At 12:20 a.m. on March 20, a security guard patrolling the Plesner offices noticed lights floating outside the 15th-floor room where TDC’s team had been working. Peering into the glare, he saw a large drone. For 10 minutes it remained there, flying up, down and sideways. Then it descended out of sight. Upon learning of the incident the following morning, the TDC investigators realized they’d failed to close the shades in the office. There was a wall-size whiteboard facing the windows on which they’d been tracing all of their leads, and it would have been in full view."
Makes it much more clear why there was so much saber-rattling about them.