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Jeremy Corbyn has said that the "truth has got to come out" about the Grenfell Fire.
The Labour leader made the comment as he visited the scene of the fire, which killed at least 17 people and made many more homeless.
Mr Corbyn was told by residents that the "country needs you".
Grenfell tower fire Show all 42 Local residents watch as Grenfell Tower is engulfed by fire
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London Fire Brigade said there has been a number of fatalities from the blaze
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The fire was first reported in the early hours of Wednesday and continued into the morning
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A local resident sees the fire over the rooftops
@Ebajgora
A firefighter reacts at the scene of the blaze
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Residents watch as the blaze continues
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More than 200 firefighters have been fighting the blaze
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London Mayor Sadiq Khan has declared the fire a major incident
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Police and fire services attempted to evacuate the concrete block of flats
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A woman runs to assist paramedics working at the fire at the Grenfell Tower
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Smoke rises from the building after a huge fire engulfed the 24 story Grenfell Tower in Latimer Road, West London in the early hours of Wednesday morning
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Fire fighters tackle the 24-storey building in West London
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Ambulances are stationed nearby
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Paramedics arrive with oxygen
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Emergency services believe it will take some time to establish the cause of the fire
Tens of people have been taken to five different hospitals across London
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A man comforts a boy after the tower block was severely damaged
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Firefighters stand amid debris in a childrens playground nearby
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Firefighters are stationed at the building
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Smoke engulfs Grenfell tower
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Lots of people donating water, food and clothing to St Clement's church for the residents of Grenfell Tower in Latimer Road
Samuel Osborne
A man speaks to a fire fighter after a huge fire engulfed the 24 story Grenfell Tower in Latimer Road, West London
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According to the London Fire Brigade (LFB), 40 fire engines and 200 firefighters are working to put out the blaze. Residents in the tower were evacuated and a number of people were treated for a range of injuries
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A resident of Grenfell Tower is trapped as smoke billows from the window after a fire engulfed the building
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Members of the emergency services work at the scene of a huge blaze which engulfed Grenfell Tower, a residential tower block in Latimer Road
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According to the London Fire Brigade (LFB), 40 fire engines and 200 firefighters are working to put out the blaze
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Fire fighters tackle the building after a huge fire engulfed the 24 story Grenfell Tower in Latimer Road, West London
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The burnt facade of Grenfell Tower, the night after the fire in Latimer Road, West London
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Local residents gather at a community centre near Grenfell Tower in Latimer Road
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A resident in a nearby building watches smoke rise from Grenfell Tower in Latimer Road, West London
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Police and rescue services operate near the fire at Grenfell Tower, a 24-storey apartment block in Latimer Road
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A man stands amid debris on the A40 after a serious fire in a tower block at Latimer Road in West London
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A view of the empty A40 highway after it was closed in both directions, due to the proximity of the fire at Grenfell Tower block in Latimer Road
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Smoke rises from the building after a huge fire engulfed the 24 storey residential Grenfell Tower block in Latimer Road, West London
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Bodies are removed from the scene after a fire engulfed the 24-storey Grenfell Tower in west London
Rick Findler/PA Wire
Bodies are removed from the scene after a fire engulfed the 24-storey Grenfell Tower in west London
Rick Findler/PA Wire
Provisions on tables at the Westway Sports Centre close to the scene after a fire engulfed the 24-storey Grenfell Tower in west London
Jack Hardy/PA
Beds are laid out in the Westway Sports Centre close to the scene after a fire engulfed the 24-storey Grenfell Tower in west London
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A pile of donated clothes, sleeping bags and water lie next to a police cordon near the burning the 24 storey residential Grenfell Tower block in Latimer Road, West London
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Signs asking for donations are seen outside the Notting Hill methodist Chruch
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Smoke rises from the building after a huge fire engulfed the 24 storey residential Grenfell Tower block in Latimer Road, West London
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A man is rescued by fire fighters after a huge fire engulfed the 24 storey residential Grenfell Tower block in Latimer Road, West London
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"Someone has to be held accountable, someone has to be held responsible," he was told.
Mr Corbyn said that the local MP – Emma Dent Coad, who was elected in a shock result last week – and Labour's housing spokesperson would each speak up for residents. "I will speak up for all of you," he said.
"The truth has got to come out," he said. "And it will."
The Labour leader also voiced concerns that everyone who lives in a high-rise flat like Grenfell Tower will be asking about how safe they are, and asked the government to give assurances to residents.
Labour MPs visited St Clements Church, where volunteers have set up a refuge centre and which has served as a base for donations and help. He met with volunteers who showed him the many donations that have arrived in the area since the disaster.
"It's great that you're in place," he told them.
The visit came on the same day that Theresa May first visited the site. She spoke with firefighters and police officers inside the cordoned area, before being whisked off in a car without speaking to reporters.
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