Government response to smear allegations inadequate, Stephen Lawrence's father says Mr Francis, who posed as an anti-racist activist in the mid-1990s, claimed he had come under "huge and constant pressure" from senior officers to "hunt for disinformation" that might be used to discredit those calling for a better investigation into the murder. Prime Minister David Cameron yesterday described the allegations as "horrific" and vowed to "get the full truth out." Metropolitan Police Commissioner Sir Bernard Hogan-Howe said he was "personally shocked" and said the he had referred the matter to the Independent Police Complaints Commission (IPCC). Speaking in the Commons, Mrs May said the allegations would be looked as part of the current inquiry being led by Derbyshire chief constable Mick Creedon into the undercover work of the Special Demonstration Squad in London in the 1980s and 1990s. She said she had also asked Mark Ellison, a QC who is investigating corruption in the handling of the Lawrence case, to examine the claims. "I am determined that we shall have zero tolerance of police corruption and wrongdoing," she told MPs. But Mr Lawrence dismissed the proposals and said and independent public inquiry was needed to reassure the public. In a statement he said: "I've always felt that my family was under greater investigation than those guilty of killing my beloved Stephen. It is unthinkable that in the extremely dark days and months after my son's murder that my family were subject to such scrutiny. He added: "I feel betrayed by this latest news and it has taken away the faith I had started to build in the police." Mr Lawrence went on: "I am convinced that nothing short of a judge-led public inquiry will suffice and I have no confidence that the measures announced today will get to the bottom of this matter." Meanwhile Lord Condon, who was Met Commissioner between 1993 and 2000, insisted no spying on the Lawrence family had been authorised on his watch. He said there could be no justification for the deliberate smearing of a grieving family and added: "My most pressing anxiety is for Mr and Mrs Lawrence who have been failed in the past by the police, which I've apologised for. They mustn't be failed again by the police or anyone. The truth must be established. Lord Condon said he accepted the initial investigation into Stephen Lawrence's murder was "woefully inadequate" but said it was a "huge step" from this to the idea of a "smear campaign" against the family. Stephen was murdered by a gang of white thugs as he waited for a bus in south London April 1993.