Updated 1:40 PM ET
PORTLAND, Ore. The gunman who killed two people and himself in a shooting rampage at an Oregon mall was 22 years old and used a stolen rifle from someone he knew, authorities said Wednesday.
Jacob Tyler Roberts had armed himself with an AR-15 semiautomatic rifle and had several fully loaded magazines when he arrived at a Portland mall on Tuesday, said Clackamas County Sheriff Craig Roberts.
The sheriff said the rifle jammed during the 22-year-old's attack, but he managed to get it working again. He later shot himself. The sheriff said authorities don't yet have a motive.
Cell phone video: Ore. mall evacuated after shooting
A law enforcement official has told The Associated Press the shooter did not have a criminal record. The official spoke on condition of anonymity because he was not authorized to discuss details of an ongoing criminal investigation.
Two people — a 54-year-old woman and a 45-year-old man — were killed, and another, Kristina Shevchenko, whose age could not be confirmed, was wounded and in serious condition on Wednesday.
The shooter, who wore a mask, fired randomly, investigators said. People at the mall were heroic in helping get shoppers out of the building, including off-duty emergency room nurses who rendered aid, Roberts said.
CBS News senior correspondent John Miller, a former deputy director of the FBI, said it was "pretty miraculous" that more people were not shot during the incident.
"He fired 'countless rounds' ... he reloaded," Miller said, before adding, "Given the amount of rounds he fired, he hit a fairly small number of people, so this could have been much worse."
In response to previous mass shootings elsewhere, the first arriving officers were trained to form teams and go inside instead of waiting for SWAT. Employees at the mall also received training to handle such a situation.
"This could have been much, much worse," Roberts said.
The first 911 call came at 3:29 p.m. Tuesday. The first officers arrived a minute later. By 3:51 p.m., all the victims and the gunman and rifle had been found. Four SWAT teams spent hours clearing the 1.4 million square-foot mall, leaving shoppers and workers to hide in fear.
The mall Santa, Brance Wilson, was waiting for the next child's Christmas wish when shots rang out, causing the mall to erupt into chaos.
About to invite a child to hop onto his lap, Wilson instead dove for the floor and kept his head down as he heard shots being fired upstairs in the mall.
"I heard two shots and got out of the chair. I thought a red suit was a pretty good target," said Wilson, 68. Families waiting for Santa scattered. More shots followed, and Wilson crept away for better cover.
Witnesses said the gunman fired several times near the mall food court until the rifle jammed and he dropped a magazine onto the floor, then ran into the Macy's store.
Witnesses heard the gunman saying, "I am the shooter," as he fired rounds from a semi-automatic rifle inside the Clackamas Town Center, a popular suburban mall several miles from downtown Portland.
Some were close enough to the shooter to feel the percussion of his gun.
Police and medics work the scene of a multiple shooting at Clackamas Town Center Mall in Clackamas, Ore., Tuesday Dec. 11, 2012.
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AP Photo/Greg Wahl-Stephens
Police rapid-response teams came into the mall with guns drawn, telling everyone to leave. Shoppers and mall employees who were hiding stayed in touch with loved ones with cellphones and texting.
Kayla Sprint, 18, was interviewing for a job at a clothing store when she heard shots.
"We heard people running back here screaming, yelling `911,"' she told The Associated Press.
Sprint barricaded herself in the store's back room until the coast was clear.
Jason DeCosta, a manager of a window-tinting company that has a display on the mall's ground floor, said when he arrived to relieve his co-worker, he heard shots ring out upstairs.
DeCosta ran up an escalator, past people who had dropped for cover and glass littering the floor.
"I figure if he's shooting a gun, he's gonna run out of bullets," DeCosta said, "and I'm gonna take him."
DeCosta said when he got to the food court, "I saw a gentleman face down, obviously shot in the head."
"A lot of blood," DeCosta said. "You could tell there was nothing you could do for him."
He said he also saw a woman on the floor who had been shot in the chest.
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