By CBS 2 Chicago Staff

CHICAGO (CBS) — A fire broke out in a pedestrian tunnel at O’Hare International Airport on Saturday morning, the Chicago Fire Department confirms.

The fire started shortly after 8 a.m. The escalator fire in the pedestrian tunnel between concourses B and C in Terminal 1 was caused by an electrical issue.

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Sprinklers went off, and the tunnel was closed and electricity turned off. Power was restored around 9:30 a.m.

People are being shuttled around the tunnel, CFD said.

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No injuries were reported.

The cause of the fire is under investigation.

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Officials with United Airlines reported that some flights were delayed due to the incident, but regular operations had resumed by noon.

CBS 2 Chicago Staff