Two 12 years old boys were busted for hatching a plan to blow up their Queens school with rocket launchers, grenades and land mines. Authorities at Intermediate School 102 on Van Horn St near 55th Road in Elmhurst found a notebook with plan written inside in gym on November 1. School staffers eventually determined who was responsible after someone recognized handwriting. NYPD arrested the pre-teens Thursday night and determined they posed no threat. Cops were referring case to Family Court, where boys are due to appear Monday.