A second teenage boy is in custody after two males on a moped carried out five acid attacks across London in less than 90 minutes.
The teenagers – aged 15 and 16 – were arrested on suspicion of robbery and grievous bodily harm following the assaults in the north and east of the capital, which the Metropolitan Police said appeared to be linked.
Two involved victims having their mopeds stolen, while one victim has been left with “life-changing” injuries after being doused on Thursday night, the force added.
Chief Inspector Ben Clark, from Hackney Borough, said all of the victims were riding mopeds, adding that it is not the case that they were all food delivery riders.
Labour MP Stephen Timms, who will lead an adjournment debate on acid attacks in the Commons on Monday, has called for tougher sentences for those found guilty.
Acid attack survivor Katie Piper said victims face a “life sentence” as she also called on tougher sentencing to act as a deterrent.
Police said the 15-year-old was arrested at an address in Stoke Newington on Friday morning, while the 16-year-old was arrested in the early hours of Friday in Kingsbury Road after he was identified near the scene of the offences by local authority CCTV operators.
Both suspects are in custody at a north London police station.
Theresa May’s spokeswoman said the Prime Minister viewed acid attacks as “horrific”.
She told a Westminster briefing: “It is already an offence to carry acid or a corrosive substance with intent to cause harm. And anyone using it can be prosecuted for pretty serious offences including ABH and GBH.
“We are working with the police to see what more we could do. The Prime Minister’s view is that the use of acid in this way is horrific.”
Commissioner Cressida Dick revealed the Home Office is working with the Met to see if a change in the law is needed