- His 37-year-old widow, who police have not identified, suffered minor injuries and was treated at the scene
- The driver of the lorry stopped at the scene in River Road and was not arrested
- The suspects are described as white men. It is not known how they got away
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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.