/US
WASHINGTON (CNN) -- A man who bolted from a security checkpoint at Miami International Airport on Monday afternoon is in custody, and officials are trying to determine what sparked his action, a federal official told CNN.
A man who fled from a security checkpoint Monday was detained at Miami International Airport.
The man, described as being in his mid-30s, was also found with "contradictory" IDs, bearing different names from different countries, according to one official close to the investigation.
The man aroused the suspicion of a Transportation Security Administration document checker, the official said. The document checker reported his suspicion to a behavior detection officer.
The man went through a metal detector without triggering an alarm, then went on to secondary screening. He bolted from there without apparent reason, going back through the metal detector to the unsecure side of the airport, the official said.
He was followed by TSA officers to the airport curb, where he was apprehended by Miami-Dade police officers. Officials said they are trying to determine the man's nationality and why he acted as he did.
The TSA closed the checkpoint for a brief time but did not evacuate the terminal.
The man was evidently traveling alone, the official said. E-mail to a friend 
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