exploding blaze this morning. two states under the gun. could be the $100 million tax dodged. did facebook s co-founder give up u.s. citizenship to escape paying his taxes? he s now in singapore driving a bentley and living it up appearing in high society magazines. why did he unfriend america? block the press. reporters at a mitt romney event blockeded from asking the candidate question. cnn the only network getting the moment on tape. newsroom begins right now. good morning to you. i m carol costello. this morning police are escorting some school buses in metro atlanta after a terrifying scene unfolded for several students on their way to school. a gunman took aim at the children while they boarded a school bus. it happened in clayton county south of atlanta s airport where police have now found the rifle, ammunition and a note with school bus numbers and pickup and arrival times. here s what one witness told tom jones of our affiliate wsb. he is shooting at that sc