A surge in thefts on the capital's streets was met with a major crackdown by police today, involving more than 7 thousand officers.
Their main target was the criminals who snatch more than 300 mobile phones every day.
More top news
Calum McSwiggan posted a photo on Instagram as he lay in a hospital bed after the alleged attack.
The London mayor publicly backed defeated candidate Owen Smith in the contest which saw Mr Corbyn re-elected party leader.
Police described it as a "growing sink hole" and it's unclear when the road will reopen.