A man has been arrested in connection with the murder of a Pakistani politician who was killed on his way home from work.
Dr Imran Farooq was attacked outside his home in Green Lane, Edgware, but died of multiple stab wounds and blunt force trauma to the head in September 2010.
A kitchen knife with a five-inch blade and a house brick used in the attack were recovered at the scene.
Officers have today arrested a 30-year-old at an address in Waltham Forest on suspicion of being concerned with the murder.
They are currently searching the address and the arrested man remains in custody in a central London police station.
Police are also keen to speak to Moshin Ali Syed, 29, and Muhammed Kashif Khan Kamran, 35, both Pakistani nationals who left the UK on September 16, 2010.
A 52-year-old man, arrested on June 2013, on suspicion of conspiracy to murder at Heathrow Airport, remains on police bail pending further enquiries.