The mother of murdered teenager Stephen Lawrence will ask the Home Secretary for either a judge-led or independent inquiry into claims undercover police were ordered to smear her family, her lawyer has said.
Doreen Lawrence will ask Theresa May about the claims made by a former officer in the Metropolitan Police's Special Demonstrations Squad.
Peter Francis said he had been asked to "dig up dirt" on the Lawrence family in the aftermath of their son's murder in 1993.
Mrs Lawrence's lawyer, Michael Mansfield QC, said: "She will be wanting something done in public, and the nearest example is Leveson, or an alternative scenario is one like the Hillsborough panel that looks at all the material.
"One of these two has got to happen. Not another internal inquiry which will not be made public because they will claim it's sensitive information.
Stephen Lawrence was murdered by a racist gang in 1993 "It doesn't necessarily have to take particularly long. Leveson was done in a year, and it's a good example of something that was done in public, and quite searing questions were asked. Hillsborough was very efficient too.
"We're not talking about a public inquiry that takes years and a report that gets left on the back-burner, we're talking about an efficient, focused inquiry."
Claims have also emerged that police had bugged meetings between officers, lawyers and Stephen's friend Duwayne Brooks, who was with him on the night that he was murdered by a racist gang.
Mr Mansfield, who represents the Lawrence family along with fellow lawyer Imran Khan, said: "I'm wondering if they did exactly the same with Imran and myself. I will want assurances that they have not done that. It's a very serious situation.
Neville Lawrence has already called for a public inquiry "This has been a very sorry saga. Doreen has been extraordinarily patient."
Earlier this week Mrs May said Mr Francis' claims would be investigated in two continuing inquiries - one into the undercover operations of the SDS and another into alleged police corruption in the original inquiry into Stephen's murder.
However, the 18-year-old's father, Neville, insisted that only a judge-led public inquiry would be enough to get to the truth.
Mr Brooks' lawyer, Jane Deighton, told Sky News that if the bugging claims were true, they were "bizarre and sinister".
Michael Mansfield QC will seek assurances his conversation were not bugged She said: "It's bizarre because it's a meeting that the police sought, it was a meeting that the police felt they had to seek after the Macpherson Inquiry had found that they had treated Duwayne in an institutionally racist way.
"The meeting was sold to us as a measure the police were taking to treat him with the respect he deserved.
"It's bizarre and it's sinister that they should have sought authority to bug this meeting."
A Metropolitan Police spokesman said: "An investigation into the circumstances of what took place has now been started by the DPS (Directorate of Professional Standards).
"This investigation will seek to establish exactly what was authorised and what happened to any material which may have been gathered, in the context of the legal framework of that time."
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