The masked gunman who went on a shooting spree in Oregon has been identified as Jacob Tyler Roberts.

The 22-year-old gunman opened fire with an AR-15 semi-automatic weapon at the Clackamas Town Center mall in Portland on Wednesday.

Roberts killed himself with a self-inflicted gunshot.

Other victims of the rampage includes a 54-year-old woman and a 45-year-old man who were killed, and a 15-year-old girl was wounded as well.

Sheriff Craig Roberts addressed a crowd of reporters during a press conference today to confirm that the gunman was carrying a stolen firearm and wore a mask during the incident at the mall.

"At this time we do not understand the motive of this attack except to say no apparent relationship between suspect and victims," Roberts said at a news conference, as reported by ABC News.

The sheriff added: "I believe, at least from the information that's been provided to me at this point in time, it really was a killing of total strangers. To my knowledge at this point in time he was really trying, I think, to kill as many people as possible."

A teenage victim, Yevgeni Shvechenko, survived the incident and is in a stable condition. Her name was released by the Oregon Health & Science University Hospital on authorization of her family.

A Facebook update regarding the girl's condition has been posted by the family stating: "As of now she is stable and sleeping. the bullet went trough bruising her lung, it missed any vital organs and it missed her ribs. she will need 2 more operations. we appreciate any and all support including your prayers! thank you."

Roberts did not have a criminal background, according to the MSN.

The gunman opened fire in the crowded mall sending thousands of shoppers panicking.

Police recovered a rifle, multiple shell casings and a white hockey mask matching the one witnesses said was worn by the shooter.

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