Federal investigators are taking the lead in a probe involving a false report. Details about the origin of the threat have come to light, prompting the change. The incident is thought to be linked to a swatting case elsewhere.

A response was mounted by officers and other agencies after the report was made. The FBI has warned that such calls can put people in harm's way.

Further information about the incident is available, including the possible connection to other events. The investigation is ongoing, with federal authorities now in charge.