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Ft. hood had a different statement. >> we me of that the immediate precipitating factor was more likely of ans indicated argument in the unit area, but were still conducting that investigation. >> reporter: what we do know about the details about this verbal at indication, that ivan lopez came to this base sometime on wednesday afternoon asking for a leave request form. when he was told to come back a day later, thats when things unraveled. theres still no clear motive here, army officials are t...

A lot, both on and off camera. our justice correspondent pamela brown is in fort hood. pamela, what is the latest tonight on what youre hearing? >> reporter: well, a u.s. military official with direct knowledge of the investigation telling our barbara starr that that traumatic brain injury that lopez had reported actually came from a reported fall during patrol, not from a traumatic event related to combat. and john, we learned from military officials today that there was an argument that escala...

A leave request form. cnn has learned in the weeks before his deadly rampage at ft. hood, army specialist ivan lopez was creating a stockpile of ammunition. sources say when lopez bought his handgun at this store, guns galore in killeen, texas on march 1, he purchased one what source calls a large amount of ammo. cnn has learned the 34-year-old returned to the store repeatedly to buy even more bullets. its the same place where major nidal hasan bought the weapon he used in the 2009 ft. hood atta...

Have unfolded the killer specialist ivan holmes. people close to the investigation said a lot on and off camera. pamela, what is the latest tonight on what youre hearing? >> reporter: u.s. military official with direct knowledge of the investigation telling our barbara starr that that traumatic brain injury lopez reported came during a fall during a patrol. we learned from military officials today, that there was an argument that escalated between lopez and another soldier in the moments right b...

Special coverage of the search for flight 370. but first theres breaking news about the shooting rampage in ft. hood, texas, in which a gunman killed three people and wounded 16 others before turning the weapon on himself. officials say the shooting may have been triggered by an argument. lets go live to our cnn justice correspondent pamela brown. shes at ft. hood with the very latest. pamela? >> reporter: wolf, military officials confirming today there was an argument that escalated between lop...