From the Document: "In the early morning hours of December 25, 2020, residents of downtown Nashville, Tenn., began calling 911 to report the sound of gun shots. When officers arrived, they located a recreational vehicle (RV) parked in front of a commercial communications building playing a pre-recorded message for residents to evacuate the area with a countdown to an explosion. As officers began to evacuate the area, the RV exploded. The explosion caused a fire within the building, as well as flooding on the first and second floors following two water main breaks. According to a source familiar with the incident, it disrupted about 170 public safety answering points (PSAPs) in the immediate and neighboring areas, and as far as Kentucky and Alabama. Telephone, data, and internet outages were seen as far as Atlanta, Ga. [...] The response to this explosion required partnerships from local utility companies, local-level public safety agencies including PSAPs, local and federal law enforcement agencies, multiple communications service providers, local government representatives and county code enforcement, and regional healthcare facilities. [...] The impacted service provider produced much of the voice, data, and internet service in the region. The outage impacted local and regional PSAP operations, impacted hospital communications, civilian communications, and even commercial business operations."
Cybersecurity and Infrastructure Security Agency: https://www.cisa.gov/