Interior Minister Rehman Malik tried to prevent key evidence being presented to London Metropolitan Police detectives investigating the murder of a politician, The Telegraph reported Friday quoting Lord Nazim Ahmad as saying. Lord Ahmed claimed he had received a call out of the blue from Mr Malik on the night before they had been due to meet detectives, asking him not to meet police for fear the evidence would poison relations between the parties. I told him I was a member of the House of Lords and he could not tell me not to do my job, Lord Ahmed said. One man has been arrested on suspicion of murder but police are still hunting a man seen at the scene, as well as a network of accomplices. The paper said the investigation could be kick-started with the new evidence from Dr Zulfiqar Mirza, who is understood to have brought details of telephone intercepts relating to a plot to kill Dr Farooq, implicating figures within the MQM. Lord Nazir and Dr Mirza were attacked in the street last week as they arrived for a television interview in Manchester. Police are treating the incident as politically motivated. It is understood that the new evidence, which has now been presented to Scotland Yard, includes details of telephone conversations between the two alleged assassins and an MQM fixer. The two men allegedly used false identities and student visas to enter Britain. Local media reported they had been detained in Karachi in August but Pakistani authorities deny they were ever arrested. Other intercepts allegedly detail conversations saying that they were to be killed on their return to Pakistan. Imtiaz Gul, director of the Centre for Research and Security Studies in Islamabad, said: This case could be explosive, particularly if it implicates the MQM. And once again it seems as if you have politicians trying to protect themselves rather than doing what is best in the long-term interests of the state. Calls to Mr Maliks office were not returned. However, a senior government official played down any suggestion of interference in the murder hunt. It is not possible to interfere with an investigation in an independent country like that, he said. A spokesman for the British High Commission in Islamabad, said: We are happy with the level of co-operation from the Pakistani authorities in this case.