The FBI is investigating a rash of telephone bomb threats to buildings in 30 counties in Tennessee, Reuters reports.
Public facilities such as courthouses were shut down Tuesday following the threats.
“There were no devices found,” Dayla Qualls, spokeswoman for the state Department of Safety and Homeland Security, told Reuters.
Among the targets were the FBI and Criminal Justice Center in Memphis, both of which were evacuated.
Officials are trying to determine whether the bomb threats are tied to others around the country.
“We are working with the other divisions of the FBI in the other affected states to make a determination if there is a connection,” and if that is found the FBI will investigate any violations of federal law, said Joel Siskovic, spokesman for the FBI in Memphis.