9-1-1 Centers have experienced a different version of a TDoS attack on their administrative lines. The TWIST is that when these calls are answered, you join an in-progress ‘conference call’ created by the attacker. Call takers from numerous 9-1-1 centers are all bridged together.
This causes confusion and it can take a few minutes to identify what is occurring. The attackers continuously generate calls to the centers, overloading the administrative lines.
The FBI is involved ( a few counties in Maryland have also been attacked). It appears these TDoS attacks are originating overseas.
Obtaining the phone numbers of a police department is easy- the attackers are launching simultaneous dialing to multiple 9-1-1 centers.