A neighbour has told ITV London how shortly after the bodies of three children were discovered, two relatives of the family knocked on her door and were clearly very distressed.
"We heard a commotion and we saw lights and four police cars came up and one ambulance and a few other cars," Michele Bacchus said.
"A little while later my partner was outside having a cigarette and two women came up and asked if they could use the lavatory. One was fairly young and very, very upset, she could not speak.
"They were very, very upset. The younger one was in shock, they were both in shock."
More top news
Police have released 12 images of people wanted in connection with what they describe as 'disorder' at a McDonalds in central London.
A man in his late 20s was taken to hospital last night after he was stabbed in east London.
Jeremy Corbyn will call for a new wave of grassroots support as he launches his leadership campaign today.