An 11-year-old boy tried to stab a middle school teacher in an institute near Trapani in Sicily on Friday but was restrained by classmates before he could strike.     The boy had put on a wraparound helmet to prevent him being identified before the attack at San Vito Lo Capo.     He had brought two small knives to school and tried to stab the teacher in front of his classmates, while filming the attack on his phone inside a Telegram group.     The teacher was unhurt.     ALL RIGHTS RESERVED ©