A man trying to board a flight to Muscat, Oman, was arrested at the Karachi, Pakistan, airport Sunday after batteries, a circuit board and an on-off switch were found in his shoes, Pakistani authorities said.
No explosives were found, authorities said.
The man, identified by Pakistani authorities as Faiz Mohammed, a 30-year-old civil engineer who works for a construction company in Muscat, was searched when a scanner sounded an alarm as he prepared to board a Thai Airways flight to Muscat.
There was no immediate indication from Pakistani security officials on what they thought the intended use of the batteries and other materials might have been.
Officials said the man told interrogators he had come from Pakistan's Khyber-Pakhtunkhwa Province, until recently called North West Frontier Province, an area where Taliban and militants have a presence.
The man lives in East Karachi, officials said.
–CNN's Tommy Evans and journalist Shad Khan contributed to this report.