The complex in Dalston Lane, Hackney, has been sealed off by police as they investigate the incident. Video footage shows officers rushing to the area in the early hours of this morning.
Members of the public were standing outside the building awaiting news.
One witness tweeted: “A block-wide evacuation has just taken place in Hackney on Dalston Lane.
“The whole block was awoken by police banging at 2:15 this morning.”
They added police were responding to an “incident”.
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