According to reports in UK media, one person is in critical condition while 3 others were injured in different knife attacks during the festival today.
Sky News reports that,
Emergency services were called to Wornington Road in Kensington and Chelsea at 4.25pm on Sunday, the day the festival is dedicated to children and families.
A second man was arrested on suspicion of causing grievous bodily harm.
Minutes later, police were called to another stabbing on Portobello Road, taking one person to hospital.
And less than an hour after that, two men were stabbed on Ladbroke Grove.
They were also taken to hospital.