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alato, erwha helicopter is on its forcetoter t fceord m expernced engeaytho te on waye ai t.orrp wato airport. l pan idthn did te thghway 101.hi ap happening hig r bhte rigef b 5:00. the pilot was the only one on board and he's not injured. >>>ed iraq war may have taken innocent lives here at home. police say a veteran of the war who suffered from posttraumatic stress disorder killed his 11-year-old sister. nbc's mary ann favreau has more. >> reporter: police tell me that she did not own a car. and they're wondering how she may have gotten away from this area without a vehicle. especially if she's wounded. now, police say they have canvassed the entire neighborhood. they've also checked with local hospitals, still, they cannot find the mother. >> i heard a scuffle upstairs and i paid no attention to it. >> reporter: mario was in the unit below when he heard a commotion upstairs. he was shocked when police later revealed what had happened. >> as a result of the preliminary investigation, right now we have determined that ava gutierrez did shoot his 11-year-old sister. and his mother, martha, she's 52 years old, and she's missing. >> reporter: pol