The test will be repeated, but contamination has not been ruled out. The victim's family's lawyer: "The procedural truth has already been established."
Giovanni Zippo did not respond to investigators but spoke to his lawyer: "The situation got out of hand, now he's ready to pay." Jacopo Peretti, 33, died in the explosion.
According to investigators, a long-planned plot: aiding and abetting is suspected, with someone apparently helping him. A recent mug shot of the young man has been released.