Former Metropolitan Police Commissioner Lord Stevens is to be investigated by the Independent Police Complaints Commission (IPCC) in connection with the inquiry into Scotland Yard's handling of the murder of Stephen Lawrence.
The IPCC confirmed it was investigating the UK's former highest-ranking serving officer over his evidence to the Macpherson Inquiry in 1998, which found "institutional racism" within the Metropolitan Police.
Scotland Yard said it had referred the matter to the IPCC last year after a complaint following the damning review of the Lawrence case by Mark Ellison QC.
A Met police spokeswoman said the complaint was made "in relation to Lord Stevens' role as the then deputy commissioner and disclosure to the Macpherson Inquiry".
I'm glad that they're actually doing what they were supposed to do because this is not the first time that we've asked them to look into it and they've come back with a negative result.
I'm hoping that this time they're going to come back this time with a result that can help us to get further into the truth of what was happening during the investigation into Stephen's death.
An IPCC spokeswoman said: "We can confirm we are independently investigating Lord Stevens following a referral from the Metropolitan Police."
People should be deterred from being involved in criminal gang activities but those involved in so-called "joint enterprise" crimes should be sentenced for the crime they are guilty of, Sir Alan Beith has said.
The Justice Committee, chaired by the MP, has called for a review of the legislation, which currently contains a rule that in a joint enterprise murder, it is not possible to charge "minor" players with a lesser offence such as manslaughter.
An urgent review is needed into the so-called 'joint enterprise' legislation which was used to convict the men who murdered black teenager Stephen Laurence, a group of MPs has said.
The legislation currently contains a rule that in a joint enterprise murder, it is not possible to charge "minor" players - who did not encourage or assist in the crime - with a lesser offence such as manslaughter.
The Justice Committee wants that rule scrapped to stop people being sentenced to life in prison for murder when they were not directly involved in the killing.
Joint enterprise laws can apply to any offence, but has recently been used to prosecute murders - in particular ones involving gangs.
They have been invoked in a number of high-profile cases, including the 1993 stabbing of 18-year-old Stephen Lawrence in south London.
David Norris and Gary Dobson were convicted under the rules for his murder.
A sixth man held over the murder of black teenager Stephen Lawrence in 1993 will not be charged after prosecutors said there was insufficient evidence.
The Crown Prosecution Service said no further action would be taken against the man, who has not been named and was arrested 11 months ago.
"After careful consideration it has been decided that there is insufficient evidence for a realistic prospect of conviction," deputy chief crown prosecutor Lionel Idan said.
Mr Lawrence was 18 when he was stabbed to death by a group of up to six white youths in an unprovoked attack as he waited at a bus stop in Well Hall Road, Eltham, south east London, with a friend
An investigation has been launched over the conduct of one serving and two former Met Police officers in relation to the Stephen Lawrence case.
The Independent Police Complaints Commission will investigate allegations of discreditable conduct and breaches of honesty and integrity by Commander Richard Walton.
He is accused of meeting with an undercover officer in 1998 and obtaining information about the family of Lawrence and their supporters "potentially undermining the inquiry (into Stephen's murder) and public confidence", the commission has announced.
They will also investigate allegations of discreditable conduct on the part of two former Met officers - then Detective Inspector Robert Lambert and Commander Colin Black.
The IPCC started the probe after the Stephen Lawrence Independent Review undertaken by Mark Ellison QC.
The mother of Stephen Lawrence is being tipped as Labour's candidate to fight the 2016 London mayoral elections.
Doreen Lawrence has campaigned for justice since her teenage son was murdered in 1993, and was named the most powerful woman in the country in a list compiled for Radio 4's Woman's Hour.
Labour policy coordinator Jon Cruddas MP wrote in The Sunday People that the "influential and dynamic" peer is "a class act and going from strength to strength".
A Labour Party spokeswoman said: "The Labour Party's selection process for our London Mayoral candidate is not yet under way."
Two men were arrested on suspicion of criminal damage following an incident at the Stephen Lawrence memorial plaque in southeast London, the Metropolitan Police said.
Police said the pair are alleged to have spat at the memorial and broken a flower pot.
The men, aged 18 and 19, have since been released on bail until May 29th.
Home Secretary Theresa May has said it may be difficult to find out who was responsible for authorising an undercover police officer to spy on the family of Stephen Lawrence.
But Mrs May assured MPs that "every effort" will be made to ensure the truth comes out in the numerous investigations and inquiries into the police's conduct after Stephen was killed.
She spoke after Labour's Diane Abbott called for an assurance the identity of whoever authorised the Special Demonstration Squad's (SDS) "spy in the Lawrence camp" will be revealed.
But Mrs May suggested that Scotland Yard's record keeping on its own investigations into police corruption may make it difficult after the review also revealed the mass shredding of key evidence in 2003.
She said: "I think everybody in this House and across the country was shocked at the findings of the Ellison review, particularly in relation to the question that there was somebody from the
Special Demonstration Squad who was, in the terms that Mark Ellison put it, effectively a spy in the camp around the Lawrence family.
"Every effort will be made to ensure that the truth comes out in relation to this."
Scotland Yard is to request a private meeting with the parents of murdered teenager Stephen Lawrence to share the findings of the criminal investigation into alleged misconduct by undercover officers.
The force is writing to Doreen and Neville Lawrence in order to discuss Operation Herne, the probe into Scotland Yard's Special Demonstration Squad (SDS) - the top secret unit that was up and running for nearly 40 years.
The brother of murdered teenager Stephen Lawrence has said he would agree to take part in a probe into police records following a damning report which found that officers spied on his family.
Metropolitan Police Commissioner Sir Bernard Hogan-Howe plans to appoint an "independent multi-disciplinary team" to search the force's archives for any available evidence for a public inquiry into undercover policing.
Speaking to the BBC, Stuart Lawrence said: "I reserve judgment until I hear who he's tried to employ to try to do this job and I wouldn't mind being part of the team myself to ensure the job is done".