(FLINT, Mich.) -- The FBI is investigating the motive behind the stabbing of an airport police officer at Bishop International Airport in Flint, Michigan, Wednesday morning.
The police officer is in stable condition and the suspect, whose identity was not released, is in custody and being questioned, airport and FBI officials said.
The airport, which was evacuated and shut down, said all passengers were safe amid the investigation, headed by the FBI.
The motive of the assault is under investigation, the FBI said, adding that it is too early to determine whether it was an act of terrorism.
"We believe this to be an isolated incident," the FBI added. "We currently have no specific, credible information that there is a threat to the Flint community."
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The Department of Homeland Security is monitoring the situation but at this point is not advising airports to to make any changes, DHS spokesman David Lapan said.
The airport reopened later Wednesday afternoon and said it was "working to get back to normal operations."
Michigan Gov. Rick Snyder wrote on Twitter, "please keep the attacked officer in your thoughts & prayers."
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