FBI Director Robert Mueller said federal charges will be filed today against alleged Arizona shooting suspect Jared Lee Loughner.

Mueller said Loughner will face charges stemming from Saturday's gun rampage in Arizona, which left Rep. Gabrielle Giffords, D-Ariz., fighting for her life. Six people, including U.S. District Judge John Roll, died in the incident and 14 others were wounded.

"The target was the congresswoman," Mueller said.

Mueller, Pima County Sheriff Clarence Dupnik and U.S. Marshal David Gonzales participated in the news conference. Here is what they said:

Update at 1:33 p.m. ET: Dupnik decries Arizona gun laws. "We're the tombstone of the United States of America. ... I have never been a proponent of letting everybody in this state to carry weapons whenever they want and that's almost where we are." He said the Arizona Legislature "is proposing students and teachers be able to carry weapons. ... Colleges should be run by college presidents, not the Arizona Legislature."

Update at 1:31 p.m ET: "When the rhetoric about hatred ... about mistrust of government" gets heated, Dupnik says, it inflames "the public 24 hours a day, seven days a week." Dupnik says that "has impact on people, especially those who are unbalanced personalities to begin with."

Update at 1:30 p.m. ET: Dupnik says Roll, the federal judge, was not accompanied by U.S. marshals on Saturday. He said those marshals are only present when a threat has been reported. The judge was "very nearby Gabrielle" at the time of the shooting, Dupnik says. Roll had been there to talk to Giffords about business.

Update at 1:28 p.m. ET: Dupnik says there were 31 bullets in each of the two magazines carried by the alleged shooter. He says there was some correspondence between the suspect and Giffords' office about attending a constituent event in 2007.

Update at 1:26 p.m. ET: Dupnik says there is "no question" about the need for heightened security, not only for lawmakers when they are in Washington. "Local law enforcement...unless there is some specific request are not even aware of the numerous appearances" by members as they occur every day, Dupnik says.

Update at 1:25 p.m. ET: Dupnik says the shooting on Saturday began around 10 a.m. Arizona time, maybe 10 minutes after. "You can call most murders a hate crime," Dupnik said in response to a question about how he would characterize the shooting. He clarifies that investigators are searching for a "person of interest."

Update at 1:23 p.m. ET: Dupnik salutes a woman who grabbed the magazine as the alleged shooter inserted another magazine, which didn't fire because of a malfunctioning spring. The woman was wounded as she tried to get the gun away from the suspect, Dupnik said. Two men subdued the suspect on the scene. He says there are six people dead and 14 others were shot.

Update at 1:22 p.m. ET: U.S. Marshal David Gonzales declined to address specifics about the slaying of U.S. District Judge John Roll, who attended the Giffords event.

Update at 1:21 p.m. ET: Mueller said it is possible that charges might be brought under domestic terrorism statutes.

Update at 1:20 p.m. ET: Mueller said there are discussions going on about the security of Congress. He said the FBI "pursues to the end" threats to members of Congress. He said U.S. Capitol Police and the Senate sergeant at arms are informing members of security steps to be taken in the future.

Update at 1:19 p.m. ET: Mueller said there is a search for a "person of interest." There is a photo of an individual who was in the grocery store at the time of the shooting.

Update at 1:18 p.m. ET: Mueller said it appears "the target was the congresswoman."

Update at 1:17 p.m. ET: "The ubiquitous nature of the Internet means ... hateful speech more readily available than 10-15 years ago. That absolutely represents a challenge to us," Mueller said. He said the FBI is still doing an analysis of computers seized in the search.

Update at 1:16 p.m. ET: Mueller said there is an indication that the suspect attended a similar event that Giffords held in 2007. She was shot Saturday while meeting with constituents outside a supermarket.

Update at 1:14 p.m. ET: Mueller said about the suspect's Internet postings: "The investigation will look at every one of those postings. ...We will look at every one of his associates to determine if they pose a threat."

Update at 1:13 p.m. ET: Dupnik says there was a 9-year-old girl who was shot and deceased. Muller said the suspected gun was purchased at a gun shop.

Update at 1:11 p.m. ET: Mueller said the suspect purchased a Glock 9 mm in November 2010. He said this is a joint investigation with FBI and Arizona officials. Mueller said he is there to "ensure that no stone is unturned."

Update at 1:10 p.m. ET: Mueller said the suspect will be charged with the killing of U.S. District Judge John Roll, the assault on Giffords, her staffers and the others who were victims.

Update at 1:08 p.m. ET: Mueller said he would not comment on Arizona gun laws. The suspect purchased weapons last year, he said.

Update at 1:07 p.m. ET: There is no information at this type that any specific threat remains, Mueller said.

Update at 1:05 p.m. ET: FBI Director Robert Mueller decries the violence. "This was an attack on our institutions and on our way of life," he said. Formal charges are expected this afternoon on suspected shooter Jared Loughner. Investigators will ... "ensure that justice is done," Mueller said.

Update at 1:04 p.m. ET: Pima County Sheriff Clarence Dupnik is speaking. The investigation "is far from over, but progressing very, very smoothly."

(Posted by Catalina Camia)