A teenager who shot dead eight people in a US shopping centre before killing himself wrote in a suicide note that he wanted to be famous.
Robert Hawkins, 19, from Bellevue, Nebraska, opened fire at the Westroads Mall in Omaha on Wednesday.
A woman who took him in after he left home said he left a note saying he was sorry for everything and did not want to be a burden to anybody.
Police have confirmed the existence of the note, but not its contents.
Hawkins struck as the centre was crowded with Christmas shoppers, and witnesses spoke of people screaming and scrambling to find safe shelter.
Five people were wounded, two of them critically.
In a statement, President George W Bush - who visited Omaha earlier in the day for a fundraiser - said he was "deeply saddened" by the shootings.
The shooting took place inside the upmarket Von Maur department store at the Westroads Mall.
Police were called at about 1400 local time (2000 GMT), after receiving a call from inside, said Sgt Teresa Negron.
He just stood there with his arm like this, his hand straight up in the air, shooting. And then I turned and ran
In pictures: Omaha shootings
Shooter 'had problems'
Witnesses said the gunman fired down on shoppers from a balcony on the third floor of the Von Maur store, using what police said was an SKS rifle to shoot at random.
By the time police arrived at the scene six minutes later, the shooting was over, she said.
Jeff Schaffart was shot in the arm as he spent his lunch break shopping with his wife, Reuters news agency reported. He said he hid in a Von Maur women's bathroom, using his tie as a tourniquet to slow the bleeding.
"I was obviously very fortunate. Not a lot of people were so fortunate today," said Mr Schaffart.
MASS SHOOTINGS IN 2007
Oct 2007: Asa H Coon, 14, shoots four people, injuring them, at his school in Cleveland, Ohio, before killing himself.
April 2007: Cho Seung-hui , 23, shoots 32 people dead on campus of Virginia Tech university, Virginia, then kills himself.
Feb 2007: Sulejman Talovic, 18, shoots dead five people and injures four at a mall in Salt Lake City, Utah, before being killed by police.
Chuck Wright was working at the mall when he heard a "pop pop" sound.
"A lady that I work with on the same floor, she happened to walk over to the [central atrium] and she was standing there and a gentleman walked up, and the shooter reached over the top on the third floor and shot the guy in the head."
Another woman also described seeing the gunman on the attack.
"I went around and then I saw the guy in the children's department," she said.
"Big tall guy, real tall and he just stood there with his arm like this, his hand straight up in the air, shooting. And then I turned and ran."
Witnesses spoke of trying to hide as they waited for police
Seven people were found dead at the scene, and another two died after being taken to a local hospital.
In an e-mail to the BBC, one Omaha resident, called Julie, said that she had been in a restaurant next door to Von Maur department store when the shooting began.
"Someone came in to the restaurant and advised that someone was shooting in the mall and to get out. Everyone started to run out of the small doors in Panera [the restaurant], so we were able to get out very quickly.
"I heard screaming and loud shots being fired somewhere close by. I got out of the mall before the local police department arrived."
The gunman, Robert Hawkins, is said to have suffered from depression in the past, and recently lost his job at McDonald's and broke up with his girlfriend.
He was living with a friend's family in Bellevue, an Omaha suburb.
His friend's mother, Debora Maruca Kovac, told the Associated Press news agency that when he first came to live with them, "he was introverted, a troubled young man who was like a lost pound puppy that nobody wanted".
She said he phoned her about 1300 on Wednesday, telling her that he had left a note for her in his bedroom. She tried to get him to explain.
"He said, 'It's too late'," and then hung up, she told CNN.
In the note, she said, Hawkins had written that "he was sorry for everything, that he didn't want to be a burden to anybody, he loved his family, he loved all of his friends".
The note went on to say he wanted to be famous, she said.
Omaha Police Chief Thomas Warren said the shooting appeared to be "very random and without provocation".
"We do have a [suicide] note. I can't describe the contents of that note, but it does appear this incident was premeditated," he added.
The incident is the latest in a series of mass shootings in the US, which have reignited the debate in the US about gun ownership.
The Supreme Court will consider Americans' right to bear arms early next year for the first time in nearly 70 years.
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