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Despite early suspicions that the local mafia were behind the blast, police now believe the bomber may be a loner, "a person at war with the world, the victim and enemy of all, who wanted to let his rage out", said the Brindisi chief prosecutor, Marco Dinapoli.
Although the video is too grainy to clearly make out the man's face, police noted he was not wearing gloves and have been dusting the kiosk for fingerprints as well as removing cigarette butts for DNA analysis.
Police have reportedly checked lists of former and present teachers at the school. "He knows the area, the school and the its timetable well," said Dinapoli.
A local woman told police she had seen a man load three gas cylinders into the wheeled bin at around 2am on Saturday.
Video footage shows the man in his 50s at the kiosk activating the remote control at 7.38am before hiding himself behind the kiosk, just after a bus stopped at the school to drop off pupils from the nearby town of Mesagne.
Police suspect the remote control triggered a movement sensor connected to the gas bomb. The blast occurred 50 seconds later as the pupils walked past the bin. Investigators said a knowledge of electronics was required to construct the bomb. A soldier with experience of electronics was detained but released after he produced an alibi.
http://www.guardian.co.uk/world/2012...ombing-suspect