I read earlier the ex-soldier was already released.
“Media in Brindisi reported that two men, one a former soldier with knowledge of explosives, had been questioned by police and released. There was no confirmation from prosecutors.”
http://www.reuters.com/article/2012/05/20/us-italy-bomb-idUSBRE84J0B420120520
Was stationed at San Vito Air Station, about 12 miles outside Brindisi, from ‘78-’80. Port city with many interesting people from the world coming through/visiting. Also the host of numerous Communist demonstrations. The Itals have turned robbery into an art - one military guy bought a stereo downtown and put it in his trunk. While he was stopped in traffic, a couple Itals used a pry bar to pop his trunk , grab the stereo, and hightail it while he sat in the car. Another trick was for them to send kids down the streets of the towns Americans lived in and hit the hoods of parked cars to see which ones had motion alarms. Made it easier to steal the cars later that night. Areas were “protected” by vigilante forces (their actual name). If you paid the monthly fee, your stuff was fairly safe. if you did not pay, you could kiss your stuff goodbye - don’t know if they actually stole it or if they just told the crooks which places were fair game.