In this task, you are given an article. Your task is to summarize the article in a sentence.

Q: Detectives recovered new evidence from the strap of a bag found close to the bus stop where the 18-year-old A-level student was stabbed to death.
Improvements in forensic testing led to the breakthrough, the Met said.
Stephen Lawrence was murdered by a group of six white youths in an unprovoked attack in Eltham in 1993.
Gary Dobson and David Norris were found guilty of his murder and sentenced to minimum terms of 15 years and two months and 14 years and three months in January 2012.
The investigation into Mr Lawrence's death remains open, with around 13 officers still working on the case led by Det Ch Insp Chris Le Pere.
The black leather strap, which did not belong to Mr Lawrence, is believed to have been left in Dickson Road, by the junction with Well Hall Road close to the scene of the murder on 22 April.
The BBC understands there is no suggestion that a woman was at the scene of the attack but officers are seeking to establish who the bag belonged to, and why it was at the spot where Stephen was attacked.
A reconstruction and appeal for information will be shown on BBC's Crimewatch at 21:00 BST on Monday, on the eve of what would have been Stephen Lawrence's 42nd birthday.
His father, Neville Lawrence, will also appeal for further information about the murder.
Officers have spoken to around 110 people in connection with this line of inquiry, and gathered 50 DNA samples.
Police are still trying to trace a man reportedly seen in a distinctive green jacket with a V emblem near Well Hall Road Roundabout at about the time Mr Lawrence was attacked.
CCTV footage, recently digitally enhanced using techniques not available in 1993, showed him in a nearby off-licence hours before the murder took place.
In a sketch by a police artist, based on their accounts, the wearer of the jacket has light reddish hair.  However the man in the CCTV pictures is dark-haired.
Police say he could be a witness.

A: The DNA of an unknown woman has been found near to where Stephen Lawrence was murdered in south east London 23 years ago, Scotland Yard has said.
****
Q: His comments came as he spoke to MPs on the Treasury Committee.
UK rates have been held at 0.5% since March 2009. Most economists are not expecting the Bank to raise rates until mid-2016 at the earliest.
Mr Carney said that "even with limited and gradual rate increases it still will be a relatively low interest rate environment".
He remained vague on when a rate rise might be coming, and added:   "The question in my mind is when the appropriate time for interests to increase and that is strongly consistent with the strength of the domestic economy."
Mr Carney also said that he did not see any need for negative interest rates.
Meanwhile, he said the Bank was monitoring groups of households to find out what impact any rate hike would have.
Kirstin Forbes, an external member of the Bank of England's Monetary Policy Committee, who was also giving evidence at the same hearing, said that the next interest rate move would be upwards.
"Given the state of the UK economy, a solid recovery, I still believe certainly the next move in interest rates will be up, we will not require loosening," she said.
Mr Carney also said productivity was more likely to exceed than undershoot the Bank's latest forecasts, reducing the pressure on inflation.
Meanwhile, sterling fell after the Bank's chief economist Andy Haldane said he saw more downside risks to growth and inflation than had been indicated by the Bank's latest economic outlook.
He also reiterated his view that the Bank's next move might actually be a rate cut.
"I see the balance of risks around UK GDP growth and inflation as skewed materially to the downside, more so than embodied in the November 2015 Inflation Report," he told the Treasury Committee.
In late morning trade sterling fell by 0.03% against the US dollar, to $1.5120, and by 0.15% against the euro, to 1.4198 euros.

A: Bank of England governor Mark Carney has said that UK interest rates are likely to remain low "for some time".
****
Q: Kandyce Downer, 34, killed 18-month-old Keegan Downer, less than a year after she was appointed her legal guardian.
Keegan was subjected to what police described as "barbaric and evil" treatment, suffering brain and spinal injuries and had 153 scars and bruises.
On the day she died, Downer delayed calling 999 to dump her blood-spotted mattress, Birmingham Crown Court heard.
The short, sad life of Keegan Downer
The jury took just under three hours to reach its verdict. Downer will be sentenced on Wednesday.
Forensic testing at the house revealed traces of the girl's blood in her cot and on the bedroom wall.
Downer had been appointed sole legal carer for Keegan, who died on 5 September last year, and has four other children, the jury was told.
The court was told that on finding the toddler "unwell" in her cot, she drove off to dump the child's old mattress near a skip before alerting emergency services.
Born in March 2014 to a mother who was a heroin addict, Keegan was otherwise healthy but was put with a foster carer by social services.
Keegan, a member of Downer's extended family, was put under her guardianship around nine months before her death last September.
Also known as Shi-Anne, Keegan was described in court as a "happy baby" and had lived at Downer's family home in Beckbury Road, Weoley Castle.
Downer had told the court most of the "day-to-day" care of Keegan was down to her son and three younger children and claimed her eldest son may have been to blame for the fatal injuries.
The trial heard a leg fracture inflicted on the child would have left her in excruciating pain, making it inconceivable that someone looking after her would have been unaware of the injury.
West Midlands Police said Downer appeared to provide a loving and stable home for Keegan but she was "cunning and devious in her systemic abuse of the child".
Det Insp Harry Harrison said: "We believe the abuse started when her relationship began to go wrong. This was an extremely disturbing and harrowing case to investigate.
"What Downer subjected Keegan to was barbaric, inhuman and evil."
He added he was "astounded by the lack of emotion" shown by Downer throughout this investigation.
"She has not shown a shred of remorse or sorrow," he said.
Birmingham Safeguarding Children Board said it set up a Serious Case Review following the toddler's death "to establish what lessons could be learned by the agencies involved in this sad case".
Penny Thompson, chair of the board, said the review, which will reflect on information disclosed during the trial, could now be completed and its findings would be published in the summer.
An NSPCC spokesman said: "It defies belief that this abuse could happen at the hands of a woman who was entrusted with bringing up Keegan.
"Having already been placed in foster care as a baby, Keegan's legal guardian should have given her a stable and loving family life to grow up in.
"But instead she killed this defenceless little girl by subjecting her to the most brutal violence."

A:
A woman has been convicted of murdering a toddler who had suffered more than 150 injuries.
****
