The group has triggered the interest of investigators because the way they went about obtaining their HazMat licences is eerily similar to the approach used by the Sept. 11 hijackers when learning to fly. The driving students attended the school in small groups over the past two years. Each of them paid cash and none showed interest in finding a job in trucking afterwards. Also sounding some alarms is the fact they spoke practically no English and all relied on the same interpreter. So far, the FBI has uncovered a slew of cases where HazMat drivers obtained their licences improperly.