NORTH CHARLESTON — An internal investigation by the Charleston Airport Police acknowledged that officers made a small communication error while coordinating security for U.S. Rep. Nancy Mace. But the department concluded it was the South Carolina congresswoman’s failure to follow protocol that escalated the episode into what the police chief called a “spectacle.”

The 10-page report was among a tranche of documents released Dec. 8 by the Charleston Regional Aviation Authority in response to a Freedom of Information Act request filed by The Post and Courier regarding the Oct. 30 confrontation between Mace and airport police and staff.

According to the findings, a supervisor mistakenly told officers that Mace would arrive in a white BMW, when she instead arrived in a gray one. But investi

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