Associated Press has reported that a man has been detained at Karachi airport after electrical circuits and batteries were found in the soles of his tennis shoes.
The man concerned told investigators he bought the shoes from a market in Karachi and had no idea there were circuits inside the soles. Ostensibly, the circuitry is for massaging the feet (sic), but batteries and circuits hidden in a shoe are reminiscent of Richard Reid, the 2001 shoe-bomber. Pakistani police are still examining the shoes, pointing out that similar materials can be used in the construction of bombs.
Whatever the outcome of this particular investigation, it seems likely that the practice of requiring airline passengers to remove their shoes for scanning will continue and perhaps be intensified as a result of this incident.