Christina Taylor Greene was a 9 year old girl killed in the Tucson, AZ shooting today.

Nine-year-old Tuscon girl Christina Taylor Green was fatally shot after her neighbours invited her to go along to a political meeting.

Christina was one of six people killed when a man opened fire at US congresswoman Gabrielle Gifford's meeting in Tuscan, Arizona.

The Arizona Republic website reported that a neighbour asked if Christina along to the event because she thought she would enjoy it her uncle Greg Segalini said.

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Christina had just been elected to the student council at her school. The event was an opportunity for constituents to meet Mrs Giffords and talk about any concerns they had related to the federal government.

"The next thing you know this happened. How do you prepare for something like this. My little niece got killed-took one on the chest and she is dead," Segalini said outside the girl's house.

Christina was involved in many activities, from ballet to baseball, Segalini said.

"She was real special and real sweet," Segalini said.

Christina, who was reportedly shot in the chest, had featured in a book Faces of Hope: Babies born on 9/11.

The gunman shot at least 18 people, including Mrs Giffords, who survived a single gunshot to the head and underwent surgery.

The other victims from the mass shooting have been identified and they include an aide to Mrs Giffords, a federal judge and a pastor.

The Giffords aide was identified as Gabe Zimmerman, her community outreach director and the 30-year-old was engaged to be married.

U.S. District Judge John Roll, the chief judge for the District of Arizona, was alos killed while attending Mrs Gifford's public appearance, U.S. Marshall David Gonzales told AP.

Roll was named to the U.S. District Court for Arizona by President George H.W. Bush in 1991. He became chief judge of the court in 2006. Roll, 63, previously served as a judge in the Arizona state courts and as an assistant U.S. attorney.

He had started his legal career as a bailiff in the Pima County Superior Court. He served an assistant city attorney in Tucson and worked as a criminal prosecutor in Pima County before joining the U.S. Attorney's office in 1980, where he specialised in prosecuting drug cases.

A native of Pennsylvania, he graduated from the University of Arizona in 1969 and received his law degree from the University of Virginia in 1972.

''We in the judiciary have suffered the terrible loss of one of our own,'' Chief Justice John G. Roberts Jr. said in a statement.

''Judge John Roll was a wise jurist who selflessly served Arizona and the nation with great distinction.''

The other three victims are Dorwin Stoddard, Dorthy Murray and Phyllis Scheck