A dog which attacked five police officers in Stratford is believed to have been responsible for another attack on a passer-by last year.
The officers were set upon in Albert Square yesterday morning.
One man has been arrested.
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The film had formed part of a commemoration to the Choucair family, three generations of whom died in the fire.
John Nolan, who was found with cigarettes and two lighters, suffered burns on 65% of his body after being alight for around six minutes.
Known as Pily she died in January, seven months after the disaster, having suffered a stroke.