Three suspects arrested in connection with Howson Road murder
Police have now questioned three men in connection with the murder of Matthew Clement on Howson Road in May.
The police are still urging witnesses to come forward.
DCI Hutchison said: "We still need to speak to anyone who heard or saw people on Howson Road, Whitbread Road or the surrounding streets between midnight and two o'clock on the morning of Sunday 30 May, and to anyone who heard shots or sounds of a disturbance."
Anyone with information should call the police on 020 8247 4553 or Crimestoppers on 0800 555111.