A suspected bomber was arrested at the Jinnah International Airport in Karachi when batteries and electrical circuits were found concealed in his shoes after a thorough check-up following a scanner alarm.The man identified as Faiz Mohammad, 30, was scheduled to board a Thai International Airlines flight for Muscat. Confirming the arrest, an airport security force official said Mohammed, who holds a diploma in civil engineering, was apprehended while he was being scanned.