Armed man shoots into FBI Cincinnati building with nail gun and flees leading to interstate standoff

An armed man flashing an AR-15 style rifle fired a nail gun into an FBI Cincinnati building Thursday morning leading to a police pursuit and shots fired on an interstate, authorities said.

Two law enforcement sources told NBC News that a man got inside and fired a nail gun toward personnel before fleeing in a car.

"At approximately 9 AM this morning an armed subject attempted to breach the Visitor Screening Facility at #FBI Cincinnati," said a tweet from FBI Cincinnati just before noon. "After an alarm and a response by FBI special agents, the subject fled north onto Interstate 71."

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Clinton Co. Emergency Management Agency alerted that Interstate 71 was closed in both directions between about five exits.

"Law enforcement has traded shots with a male suspect who is wearing a gray shirt and body armor," the agency said in a statement, warning people nearby to stay inside and lock their doors.

This is a breaking news story. Please check back for updates.