At least twelve people were killed Wednesday morning when their high-rise apartment building, Grenfell Tower, went up in flames.

The fire began just before 1:00 a.m. Wednesday on the 23rd floor of the 24 story North Kensington apartment building.

The building was home to some 120 families.

In a statement, police acknowledged that a number of residents of the building had died in the fire, though authorities declined to provide details on the number of fatalities.

“There have been a number of fatalities following the fire in North Kensington in the early hours this morning,” the statement read.

“I can confirm there have been a number of fatalities and others receiving medical care.”

Police added that it there would most likely be no clear answer regarding the cause of the fire for some time.

“It is likely to take some time before we are in a position to confirm the cause of the fire.”

The London Ambulance Service has confirmed that thus far, 64 people have been evacuated from the scene of the fire to five hospitals across London. Ten others injured by the fire were evacuated by other means.

Hospital officials say 20 of the 74 injured in the fire are in critical condition.

Earlier Wednesday morning, local council leader Nick Paget-Brown told Sky News that several hundred residents were likely in the tower when the fire started. The Telegraph has reported that some 600 people were believed to have been inside the building before the blaze began.

More than 200 firefighters and 40 fire engines were deployed to battle the blaze and attempt to rescue those trapped in the building. Dozens of ambulances more than 100 emergency medical responders were also been dispatched to the scene.

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