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Eyewitness 'John Brown', a former member of the Park Lane Boys gang, who accepted a caution for assaulting his partner in 2010, said defendant Nicky Jacobs used a machete with a 12-inch blade during the attack on Pc Keith Blakelock.
He told the jury that he himself had kicked the officer some 10 times after he went to the ground.
Asked why, he said: "Looking back on it I don't know...It was the excitement of the situation, I just rushed forward and kicked him about ten times."
The witness said he had been paid a £5,000 reward by the police after giving a statement during a renewed police investigation into the killing in 1993.
Asked by Richard Whittam QC, for the prosecution, what the officer was doing during the attack, Mr Brown said: "What I saw, he was trying to curl up into a ball, I suppose to protect himself somehow.
"Did he say anything?" Mr Whittam asked.
"I just heard heard screams of 'help, help, help'."
PC Blakelock curled up in a ball and screamed for help as a mob hacked him to death during the Broadwater Farm riots, an eyewitness has told the Old Bailey.
Using the pseudonym John Brown and with his voice distorted by a modulator to protect his identity, the witness described how he saw the killing on the estate in Tottenham, north London, on October 6 1985.
He explained that he had seen Nicky Jacobs, 45, stabbing PC Blakelock with a machete between two and four times as the frenzied mob took part in a "free for all".
The Israeli army says it has seized a large shipment of munitions being sent from Iran to Palestinian groups on the Gaza Strip.
An Israeli Defence Forces Twitter account shared the following images:
One Direction's Harry Styles has won permanent High Court orders against four members of the paparazzi in his legal battle to end the "crazy pursuit" of him.
The injunction prevents the photographers from pursuing the singer by car or motorcycle.
It also stops them from placing him under surveillance, loitering or waiting within 50 metres of his place of residence to monitor his movements or take photos of him.
His barrister told a judge in London today that four individuals had so far been identified since harassment proceedings were launched last year.
All four were handed permanent injunctions while efforts to identify others are ongoing.
In December, One Direction star Styles, now 20, went to court as a last resort after trying to persuade a number of photographers to stop their behaviour voluntarily.
Prosecutor Mark Heywood QC has started his opening statements at the sexual offences trial of Nigel Evans MP.
Mr Heywood accused Mr Evans of abusing several young men "over many years" and of "abusing the positions he held" to sexually assault young men.
The prosecution alleges that he, on separate occasions over many years, has sexually assaulted young men, both in public situations and in private.
By the last of the these, in early 2013, he raped one of the young men. So the prosecution allege, he not only abused those young men, in some cases seriously, but he abused the positions he held.
Mr Evans, on the other hand, denies the allegations made, he says that in respect of, for example, the rape, events were entirely consensual, agreed upon, or the result of misreading signals or simply that either they did not happen or he has no clear recollection because of the passage of time.
Scientists have developed a new blood test that could detect whether a person will develop dementia within three years.
By looking at 10 specific blood molecules, researchers from America's Georgetown University were able to test whether people would go on to develop cognitive impairment or Alzheimer's Disease - with 90% accuracy.
ITV News spoke to Dr Alison Cook from the Alzheimer's Society:
The study monitored 525 healthy over-70s for five years. During the research, 28 participants went on to develop the conditions. 46 were diagnosed at the start of the study.
Team GB's Paralympic athletes have congratulated Kelly Gallagher and guide Charlotte Evans after they won Great Britain's first ever gold medal at the Winter Paralympics in the Super-G event in Sochi.
Former deputy speaker of the House of Commons Nigel Evans used his "powerful" influence to sexually assault seven young men, a court has been told.
He had the "ability to make or break" the careers of those who wished to work in Westminster, a jury at Preston Crown Court heard.
Evans exploited his position and pressed his sexual attentions on his victims, and carried on doing so despite being warned about his behaviour, says the Crown.
Evans, 56, faces nine charges in all, dating from 2002 to April 1 last year, involving the seven complainants.
The MP for Ribble Valley, in Lancashire, denies two counts of indecent assault, six of sexual assault and one of rape.
Opening the case, prosecutor Mark Heywood QC said: "Within the Palace of Westminster, in his constituency and in his own political party, Mr Evans was, during the decade with which you are concerned, a very well-known and powerful individual.
"Part of his influence included the ability to make, or to break, the careers of those young people who themselves would be politicians or work for those who govern.
"The prosecution case against Mr Evans is that he, often when in drink, pressed his sexual attentions on those younger men, using or trading on his position of influence.
"Now this behaviour did not happen once but has been repeated over time and despite repeated warnings given to him by others.
"It has also escalated in seriousness, no doubt because he believed that his position made it less than likely that someone would complain."
Mr Heywood continued: "The prosecution alleges that he, on separate occasions over many years, has sexually assaulted young men, both in public situations and in private.
"By the last of the these, in early 2013, he raped one of the young men.
"So the prosecution allege, he not only abused those young men, in some cases seriously, but he abused the positions he held."
"Mr Evans, on the other hand, denies the allegations made, he says that in respect of, for example, the rape, events were entirely consensual, agreed upon, or the result of misreading signals or simply that either they did not happen or he has no clear recollection because of the passage of time."
Mr Heywood then began to go through each of the allegations individually.