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i had to protect my children. >> pete: a local hospital says it has discharged or transferred all those injured in the shooting. continuing search for a motive. and governor greg act praising law enforcement's, quote, amazing courage without which he says the death toll would have been higher. abbott also revealing the gunman wrote a series of messages online before his killing spree. one saying, quote: i'm going to shoot my grandmother. another saying, quote: i have shot my grandmother and i'm going to shoot up an elementary school. >> ainsley: we are also learning the heroic cbp sp...

Boston. >> you can see these men contact law enforcement. >> reporter: hours after the fbi released the tsarnaev brothers photos just before 10:30 tuesday night, two men approached m.i.t. police officer in his cruiser. calls come into m.i.t. dispatch. >> it sounds like something is hitting a trash can really loud or there's a cruiser that's right by there. >> all right. we'll check it out. >> reporter: in that cruiser, officer collier, shot multiple times, not responding to either radio or cell call. the sergeant arrived. collier has a slight pulse, but is bleeding badly. he frantically perfor...