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Police said Sunday four of those who jumped were suspected suicides while three were still being investigated.
All the incidents took place between 2 am and 7:30 pm Saturday and were unrelated.
Of those believed to have jumped to their deaths two men, aged 48 and 49, were known to have mental problems.
The youngest to have died was a 16-year-old girl who was certified dead after jumping from the 22nd floor of a building, while the oldest was a 86-year-old man, who is also believed to have jumped.
Three cases are still under investigation: an 81-year-old woman who died, and a 17-year-old man and a 37-year-old woman both of whom were taken to hospital after being found unconscious after falling from high buildings.
Jumping from high-rise buildings is the most common form of suicide in the former British colony, followed by inhalation of poison fumes from burning charcoal.
Around 1,000 people committed suicide in Hong Kong in 2007 - about three a day.

The BBC's news website says Lorraine Griffiths and her three children have moved out of their house in Colchester in Essex to avoid coming into contact with the creature, thought to be a camel spider.
It's believed the spider was brought over in a kitbag from Afghanistan by Mr Griffith, who was serving a tour of duty there.
An RSPCA spokeswoman confirmed they had visited the house but failed to locate the creature.
The spokesman was quoted as saying, "If it is the spider they believe it is, then normally they don't attack humans, but they could give a painful bite."
Mrs Griffiths says it was seen in her bedroom by her two teenage children, and by an electrician
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The role of cow's milk in preventing bowel cancer is set to be revealed through new research at Flinders University in Adelaide.
The university said it expected to have clear evidence by the end of the year on the role milk could play in boosting the anti-cancer properties of a natural trace element, selenium.
In a human trial already underway, Graeme Young is testing the beneficial impact of selenium when delivered through cow's milk compared with other forms of the dietary supplement.
Previous trials had confirmed that selenium in milk could lift levels of selenium in the blood.
Professor Young said chemical and yeast-based forms of selenium available over-the-counter as dietary supplements had varying degrees of absorption and impact on the body.
"So those forms of selenium will differ in their capacity to change someone's antioxidant status and capacity to prevent cancer," he said.
"It just so happens that when you feed selenium to cows and they produce selenium-enriched milk, the selenium seems to be in a chemical form that is both highly absorbable into the body and also more effective in terms of preventing cancer."
In the current study involving 20 people researchers are comparing the milk form of selenium with a yeast-form of selenium and looking at how readily it gets absorbed.
"We are also taking biopsies from the lining of the bowel to make certain that the selenium is being delivered to the cells lining the bowel," Prof Young said.
"If we can establish that is occurring, then we will be more confident that selenium is going to regulate the cells lining the bowels in humans."
The anti-cancer properties of selenium relate to the way it encourages the body to rid itself of mutated cells that might otherwise become cancerous.
Previous research by the team from the Flinders Centre for Cancer Prevention and Control - published in the June issue of the international journal Cancer Research - showed that selenium-enriched cow's milk produced a significant cancer preventing effect in mice.
Prof Young said the research was focussed on prevention rather than the treatment of existing cancers.
"With the approach we are taking to prevention, you probably only need to achieve a slight, subtle effect with selenium for a benefit to become evident," he said.
How often do you see this kinda news on the net/tele/magaz.....! Arent you sick of it? Thanks to all these over-enthusiatic scientists who boost about the significant of their study BEFORE anything concrete were proven. All these articles were based on study on MICE !!!!!! Argh !!!
But i am homo sapien !!! I am NOT a mice ! Dont compare me with a rat !!
A piece of wedding cake saved from Prince Charles' marriage to Lady Diana Spencer 27 years ago has sold at auction for STG1,000 ($A2,138).
While the only bit left of the slice was a 23cm square piece of icing and marzipan weighing 800 grams, an anonymous bidder couldn't resist buying the memento.
It had originally been given to Moyra Smith, who worked for the Queen Mother at Clarence House at the time of Charles and Diana's wedding in 1981.
Smith carefully preserved the top of the slice, featuring the royal coat of arms coloured in red, gold and blue, in cling film and kept it stored in a metal tin.
"To my knowledge this is the highest price for any slice of the cake sold at auction," Britain's The Daily Telegraph quoted auctioneer Nathan Winter, of Dominic Winter Book Auctions, as saying.
As well as the cake, the anonymous bidder bought a letter from Charles and Diana thanking Smith for chipping in to pay for a clock given to them as a wedding present.
The piece of Smith's cake came from one of 22 cakes made for the royal wedding and sliced up for distribution among royal staff.
The couple also had an official five-tier cake made for their big day.
"She was very sentimental about the cake," Smith's husband Douglas, 76, said.
"She loved the royal family and looked back with great fondness."