Five men are being questioned by police after they were arrested over a video showing a model of Grenfell Tower burning on a bonfire.
The men, aged 19, 46, 55 and two 49-year-olds, were arrested on the suspicion of a public order offence, which covers intentional "harassment, alarm or distress" caused via the use of "threatening, abusive or insulting" words or signs.
The Prime Minister has joined a chorus of condemnation, after a group set fire to a cardboard effigy of Grenfell Tower.
A total of 72 people perished as a result of the tragedy at the west London block on June 14 previous year.
Theresa May was one of those who criticised the actions in the video, calling them "utterly unacceptable".
The model, labeled "Grenfell Tower", had paper cutouts of burning people at the windows of the apartment block.Several of the cutouts appeared to have been colored brown, and a St. George's Cross flag is seen waving in the background.
The video, in which the group can be heard laughing as the fire takes hold of the model, emerged on Monday and was met with a public outcry.
Another person said: "That's what happens when you don't pay your rent".
He added: "So many people lost so many loved ones, and many more have been deeply affected. To mock that disaster in such a crude way is vile", Metropolitan Police Commander Stuart Cundy told media.
"I know that the police have been made aware of this video and will work to establish whether any offences have been committed".
The video ends as the model is completely consumed by the fire, with one bystander saying: "Perfect".
London mayor Sadiq Khan said he "utterly" condemned the "sickening" video, describing the Grenfell Tower fire as "one of the most devastating tragedies our city has ever suffered".
Natasha Elcock, from Grenfell United, said: "It's a disgusting video".
"This is clearly a hate crime and as a society we should never tolerate these types of blatant acts of hatred".
The Justice4Grenfell campaign group, which includes survivors and families of the dead, said it was "shocked at the inhumanity and callousness" of those involved. We hope that the police are taking this seriously.
In a statement, London's Metropolitan Police Service called the video "vile" and urged people with information to come forward.