And that is our top story this midday.Hello, I'm Lisa CownieMilitary oAnd that is our top story this midday.Hello, I'm Lisa CownieMilitary officials are trying to figure out a motive behind the worst massacre in history on a US military base.Soldiers caught in the gunfire say the suspect, a fellow comrade, shouted words in Arabic as he opened fire.CBS News Correspondent Joel Brown is at Fort Hood , Texas with the very latest.Soldiers mowed down in the Ft. Hood shooting rampage are painting the picture of a methodical gunman."I TALKED TO ONE MAN LAST NIGHT, HE WAS SHOT 4 TIMES, BY THE SAME SHOOTER, WHEN HE MOVED, HE SAID I MADE THE MISTAKE OF MOVING AND I WAS SHOT AGAINSuspect Nidal Malik Hasan.. an Army psychiatrist.. seen in this convenience store video the day of the shooting wearing Muslin dress.. reportedly shouted "Allahu Akbar!" - an Arabic phrase for "God is great!" before he opened fire.The army says he killed Twelve soldiers and one civilian during his spree inside Ft. Hood's Solider Readiness Center.. another 30 were wounded.AT ONE POINT THE GUNMAN REALIZED A LOT OF THE SOLDIERS HAD STARTED TO ESCAPE, WALKED AND STARTED SHOOTING OUTSIDE THE BUILDINGHundreds of soldiers were inside the facility, but weren't armed because they don't usually carry their army weapons on base. A nearby active response team rushed to the scene to stop the gunman.(PHOTO)Civilian Police Officer Kimberly Munley fired at Hasan four times. She was hit too, but according to the base commander is okay and talking on the phone with friends.Hasan , a 39 year old major, is in stable condition and on a ventilator.(PHOTO)19-year-old Amber Bahr's mother learned that her daughter took a bullet in the back.MY BABY GIRL WAS SHOT, THAT'S NOT SUPPOSED TO HAPPENBut Bahr didn't let that stop her from helping other soldiers.(SOT Lt. Gen. Robert Cone, Ft. Hood)A YOUNG LADY WHO REALIZES THAT HER BATTLE BUDDY IS HURT TAKES HER BLOUSE OFF TIES A TOURNIQUET, CARRIES HIM OUTSIDE TO SAFETY, THEN REALIZES SHE HERSELF IS SHOTInvestigators have yet to speak with Hasan .. but colleagues say he was about to be depolyed to iraq and didn't want to go . Joel Brown, CBS News, Ft, Hood, TX