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In videos, details of shooting emerge

It could take weeks for investigators to fully determine Loughner's state of mind in the days before the rampage, officials said. Virtually every member of the FBI's 200-person Phoenix field division, along with 50 agents from Washington and Tucson, and more from the Capitol Police and the U.S. Marshals Service, have fanned out across southeastern Arizona. About 130 detectives from the Pima County Sheriff's Department are also involved.

"Did you notice anything that made the hair on the back of your neck stand up?" an FBI agent asked Steven Rayle and his companion, Laura Tennen, who were at the scene.

During the interview in their house, Rayle recalled, the federal agent and a Pima County deputy wanted to know "anything that was odd or spooky" about Loughner's behavior that day.

The videos create a fairly vivid picture of Loughner's alleged movements through the Safeway, which he entered sometime after 9:54 a.m. on Jan. 8, Kastigar said. The footage is now in possession of the FBI, which has declined to release it.

In one video, the gunman, whom police believe is Loughner, emerges from the store's south entrance, then loops around a table set up outside for Giffords's "Congress on Your Corner" event with constituents. The shooter is "hurriedly walking," Kastigar said, then approaches Giffords head on.

"He walks up, goes bang," the Pima County lawman said. "He is maybe 24 to 36 inches away. You can see her go straight down."

Peter Rhee, the medical director at University Medical Center, confirmed Tuesday that the bullet entered Giffords's head from the front.

The gunman then turns to his left and fires on a crowd of people who are seated or standing in line. Next the gunman turns back to his right, where 65-year-old Ron Barber, Giffords's district director, and Roll are standing. He shoots Barber, who reaches for his left shoulder.

Then, "Judge Roll starts to push Barber down and lay on top of him, and they start to scamper under the table, but Roll is on top," Kastigar said. "At that point, you can see the suspect shoot Roll. Roll gets shot in the back, then he sort of appears halfway on the other side of the table. He starts to look over his right shoulder, and then he lays back down."

Roll died at the scene, and Barber was released from the hospital in time to attend the judge's funeral. Giffords remains in serious condition.

Witnesses have given differing accounts of whether Roll was trying to protect Barber.

Giffords's communication director, C.J. Karamargin, said he could not comment on the description of the video. "We're not going to comment on something we haven't seen," he said.

Other videos from the store show the assailant firing until he has expended his entire magazine. At that point, he is tackled by bystanders.

In all, authorities believe that the gunman shot 32 bullets, one more than had been previously reported. A woman who was at the scene found a spent casing in her purse a couple of days after the incident, law enforcement officials said. Though the extended magazine clip that Loughner allegedly used holds only 31 bullets, investigators believe he had another bullet loaded in the chamber when the attack began.

Two of the bullets went through the Safeway's windows, said assistant store manager Javier Rivas. One traveled through a wall, hit a ceiling tile and ended up on the meat department floor.

The other landed in a pack of 7-Up on display in the front of the store, Rivas said in an interview. The manager found that bullet after noticing liquid on the floor and soda leaking out of a bottle.

Staff writers Philip Rucker in Tucson and Jerry Markon in Washington and staff researchers Lucy Shackelford and Alice Crites contributed to this report.

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