The 33-year-old was rushed to hospital with "critical injuries" after the incident in London, police said.
The PM broke an election tradition by voting in Westminster, rather than in his Uxbridge and Ruislip South constituency.
Focus group in Boris Johnson's seat likens free broadband pledge to communist Cuba and see Corbyn as "indecisive"
A focus group in Uxbridge showed how the opposition could still succeed, Edelman's public affairs MD James Morris writes.
A 17-year-old boy has been arrested on suspicion of murder.
#FilthyPieceOfToerag was trending.
'A few weeks ago this would have sounded fantastical: now it is political reality.'
A rally to try to unseat Boris Johnson will take place in his constituency at the weekend. The rally, organised by journalist
Does this harm his chances of becoming PM?
Lead Brexiteers Boris Johnson and Iain Duncan Smith are set to lose their Commons seats at the next election thanks to the