The explosion took place in Garratt Lane, at around 7.25am on Wednesday.
The spate of attacks led to criticism of Sadiq Khan from Donald Trump, who called the London mayor a “disaster”.
The force said 14 people – including several boys and a girl – have been arrested.
Tories keep control of Wandsworth and Westminster and win Barnet.
Barnet, Wandsworth and Trafford could all turn red.
“Let me just give your bike a check over and then we can head off.” It was 9am on a Saturday morning and the first lesson
Why is anyone surprised at all at the news that Conservative-controlled Wandsworth Council thinks that residents should pay
Government allegedly deemed sprinklers 'additional rather than essential'.