Deputy Commissioner Craig Mackey said the "only comparable advice"
police could get was from World Trade Center attack investigators
Experts who recovered remains after the 9/11 attack in New York are helping police investigators combing through debris from the Grenfell Tower fire.Metropolitan Police Deputy Commissioner Craig Mackey said 200 officerswould be sifting through 15 tonnes of debris "until Christmas time".Police also named 68-year-old Marjorie Vital as the latest victim of the west London fire to be identified.She lived on the 19th floor with her son Ernie, who has not yet been found. Grenfell Tower fire: Who were the victims?Mr Mackey said the "extraordinary size of crime scene" meant the "only comparable advice" that could be found was from investigators who worked on the collapse of the World Trade Center in 2001.He added: "Without wanting to be too graphic... the fire in some parts of that building [Grenfell] burned at over 1,000 degrees for a considerable period of time. "So we are now working through, floor-by-floor,and it is literally a case of sifting and working through the debris - sadly, the remains - to try and desperately identify parts of people so we can reunite [themwith their families]."The senior officer said the tower block was "one of the most complex recovery operations we've seen".