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Police are investigating reports money has been stolen from one of the abandoned flats in Grenfell Tower, sparking fears other properties ravaged by June's fire could have been targeted.
Authorities believe the theft took place at some point after Tuesday 20 June, six days after the devastating blaze claimed at least 80 lives.
The Met said they were unable to rule out "authorised personnel" from the investigation at this stage, suggesting that a fellow police officer could have been involved in the alleged crime.
Police refused to say how much money was reportedly taken.
"Steps have been taken to review the security of all the flats within Grenfell Tower , and some changes immediately put into place," a spokesperson said.
"One of the lines of enquiry must be to examine exactly who has had access to the site and the flats, either as authorised personnel or otherwise."
MP David Lammy, whose friend Khadijah Saye died in the fire, called the culprit "scum".
In Pictures: Grenfell Tower after the fireShow all 51 1 /51In Pictures: Grenfell Tower after the fire In Pictures: Grenfell Tower after the fire Police have released images from inside the tower where at least 58 people have died
Metropolitan Police
In Pictures: Grenfell Tower after the fire A still from a video shared by polices what appears to be a stationary bicycle sitting among the ashes
In Pictures: Grenfell Tower after the fire A still from a video shared by police shows the remnants of a burnt-out bathroom
In Pictures: Grenfell Tower after the fire Picture showing the lifts on an unknown floor
Metropolitan Police
In Pictures: Grenfell Tower after the fire Emergency crews outside the front entrance to the tower
Metropolitan Police
In Pictures: Grenfell Tower after the fire Fire crews inspecting flats in the burnt out tower
London Metropolitan Police
In Pictures: Grenfell Tower after the fire Grenfell Tower is seen in the distance
PA
In Pictures: Grenfell Tower after the fire A drone flies near the scene of the fire which destroyed the Grenfell Tower block
REUTERS/Stefan Wermuth
In Pictures: Grenfell Tower after the fire 'Theresa May Stay Away' message written on the messages of support at Latymer Community Church for those affected by the fire
Ray Tang/REX
In Pictures: Grenfell Tower after the fire An aerial view of the area surrounding Grenfall tower
Getty
In Pictures: Grenfell Tower after the fire Donated shoes sit in the Westway Sports Centre near to the site of the Grenfell Tower fire
Getty Images
In Pictures: Grenfell Tower after the fire Messages of support for those affected by the massive fire in Grenfell Tower are displayed on a well near the tower in London
AP
In Pictures: Grenfell Tower after the fire A local resident stands on her balcony by the gutted Grenfell Tower in Latimer Road
Getty Images
In Pictures: Grenfell Tower after the fire Messages of condolence are left at a relief centre close to the scene of the fire that broke out at Grenfell Tower,
EPA
In Pictures: Grenfell Tower after the fire A police officer stands by a security cordon outside Latimer Road station
Getty Images
In Pictures: Grenfell Tower after the fire Firemen examine the scorched facade of the Grenfell Tower in London on a huge ladder
AP
In Pictures: Grenfell Tower after the fire A search dog is led through the rubble of the Grenfell Tower in London as firefighting continue to damp-down the deadly fire
AP
In Pictures: Grenfell Tower after the fire Labour leader Jeremy Corbyn comforts a local resident (name not given) at St Clement's Church in west London where volunteers have provided shelter and support for people affected by the fire at Grenfell Tower
David Mirzoeff/PA
In Pictures: Grenfell Tower after the fire Labour leader Jeremy Corbyn hugs councillor Mushtaq Lasharie as he arrives at St Clement's Church in Latimer Road, where volunteers have provided shelter and support for people affected by the fire at Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire Labour leader Jeremy Corbyn meeting staff and volunteers at St Clementís Church in Latimer Road
David Mirzoeff/PA
In Pictures: Grenfell Tower after the fire Firefighters with a dog walk around the base of the Grenfell Tower
REUTERS/Peter Nicholls
In Pictures: Grenfell Tower after the fire Emotions run high as people attend a candle lit vigil outside Notting Hill Methodist Church near the 24 storey residential Grenfell Tower block in Latimer Road, West London
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In Pictures: Grenfell Tower after the fire Debris hangs from the blackened exterior of Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire A woman speaks to Mayor of London Sadiq Khan outside Notting Hill Methodist Church near Grenfell Tower in west London after a fire engulfed the 24-storey building
Yui Mok/PA Wire
In Pictures: Grenfell Tower after the fire A woman holds a missing person posters near the Grenfell Tower block
REUTERS/Stefan Wermuth
In Pictures: Grenfell Tower after the fire Sadiq Khan speaking with a resident
James Gourley/REX
In Pictures: Grenfell Tower after the fire Ken Livingstone walks near the scene of the Grenfell Tower fire
Getty Images
In Pictures: Grenfell Tower after the fire Mayor of London Sadiq Khan is confronted by Kai Ramos, 7, near Grenfell Tower in west London after a fire engulfed the 24-storey building
Yui Mok/PA Wire
In Pictures: Grenfell Tower after the fire Mayor of London Sadiq Khan speaks to a woman outside Notting Hill Methodist Church near Grenfell Tower
Yui Mok/PA Wire
In Pictures: Grenfell Tower after the fire Volunteers distribute aid near Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire Family and friends of missing Jessica Urbano, 12, wearing photographs of Jessica pinned to their t-shirts gather near Grenfell Tower
EPA
In Pictures: Grenfell Tower after the fire Family and friends of missing Jessica Urbano, 12, wearing photographs of Jessica pinned to their t-shirts gather near Grenfell Tower
EPA
In Pictures: Grenfell Tower after the fire Family and friends of missing Jessica Urbano, 12, wearing photographs of Jessica pinned to their t-shirts gather near Grenfell Tower
EPA
In Pictures: Grenfell Tower after the fire People attend a vigil at Notting Hill Methodist Church near Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire People gather to observe a vigil outside St Clement's Church following the blaze at Grenfell Tower
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In Pictures: Grenfell Tower after the fire People light candles as they observe a vigil outside St Clement's Church following the blaze at Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire People attend a vigil at Notting Hill Methodist Church near Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire A man distributes food from the back of a van near the scene of the fire which destroyed the Grenfell Tower block
REUTERS/Paul Hackett
In Pictures: Grenfell Tower after the fire A firefighter is cheered near the scene of the fire which destroyed the Grenfell Tower block
REUTERS/Paul Hackett
In Pictures: Grenfell Tower after the fire A T-shirt with a written message from the London Fire Brigade hangs from a fence near The Grenfell Tower block
REUTERS/Stefan Wermuth
In Pictures: Grenfell Tower after the fire A young girl on her way to lay flowers near Grenfell Tower
Getty Images
In Pictures: Grenfell Tower after the fire The remains of residential tower block Grenfell Tower are seen from Dixon House a nearby tower block
Getty
In Pictures: Grenfell Tower after the fire Volunteers prepare supplies for people affected by the Grenfell Tower block which was destroyed in a fire
REUTERS/Neil Hall
In Pictures: Grenfell Tower after the fire Volunteers move a car to make space for a lorry picking up supplies for people affected by the Grenfell Tower block
REUTERS/Stefan Wermuth
In Pictures: Grenfell Tower after the fire People distribute boxes of food near the scene of the fire which destroyed the Grenfell Tower bloc
REUTERS/Paul Hackett
In Pictures: Grenfell Tower after the fire A woman touches a missing poster for 12-year-old Jessica Urbano on a tribute wall after laying flowers on the side of Latymer Community Church next to the fire-gutted Grenfell Tower
AP
In Pictures: Grenfell Tower after the fire A man looks at messages written on a wall near the scene of the fire which destroyed the Grenfell Tower block
REUTERS/Paul Hackett
In Pictures: Grenfell Tower after the fire Candles and messages of condolence near where the fire broke out at Grenfell Tower
EPA
In Pictures: Grenfell Tower after the fire Police carry a stretcher towards Grenfell Tower
Rick Findler/PA Wire
In Pictures: Grenfell Tower after the fire Emergency services at Grenfell Tower
Rick Findler/PA Wire
In Pictures: Grenfell Tower after the fire Police carry out a body from Grenfell Tower in west London after a fire engulfed the 24-storey building
Rick Findler/PA Wire
"Scum. Theft from Grenfell Tower flat is a grotesque crime. Where were the police? How secure is the crime scene now?," he wrote on Twitter.
Survivors of the tragedy and the families of those who died were informed of the alleged theft on Friday.
It comes just weeks after authorities announced they would try to begin returning possessions to occupants of the 33 flats that suffered little damage in the fire.
The Met received a report on Friday 8 September of the theft. The police investigation is ongoing.