密歇根港湾斯普林斯机场收到了一个无法证明的炸弹威胁;联邦调查局和联邦航空局联系要求援助。 Harbor Springs Airport in Michigan received a non-credible bomb threat; FBI and FAA contacted for assistance.

7月30日, 密歇根港泉机场收到炸弹威胁, 声称炸弹会飞到机场, On July 30th, Harbor Springs Airport in Michigan received a bomb threat that claimed bombs would be flown to the airport, but the Emmet County Sheriff's Office concluded the threat was not credible after investigating. 当局还注意到先前在Mackinac岛发生的类似炸弹威胁,也被认为不可信。 Authorities also noted a similar bomb threat made previously on Mackinac Island, which was also deemed not credible. 与联邦调查局和联邦航空管理局联系,要求协助调查。 The FBI and the Federal Aviation Administration (FAA) were contacted for assistance in the investigation.