Detectives investigating two separate acid attacks are appealing for dash cam footage which could assist their investigation.
At about 6pm Thursday November 2, a delivery moped rider was approached by two men on a scooter as he delivered a pizza to an address in Walpole Road, Walthamstow.
They demanded he hand over his keys and when he refused, a struggle ensued. The suspects then produced a corrosive substance and sprayed him in the face.
The victim, a 32-year-old man, was wearing a helmet with the visor was up and sustained substantial injuries to his eyes and face.
The suspects left on their moped, leaving his behind. One wore a white helmet and one a black one.
Officers attended along with the London Ambulance Service and the London Fire Brigade. The victim was treated at the scene with water and taken to an east London hospital.
His condition was critical, and there were fears he could lose the sight in both eyes. He has since been discharged and it is hoped that he will make a full recovery.
Officers are also investigating a second incident in which a corrosive substance was used a short time after the Walthamstow attack.
At about 6.30pm on Yarmouth Crescent in Tottenham, a second man was also attacked.
This man - also a 32-year-old delivery driver - was approached by two men on a scooter who attempted to steal his moped.
A corrosive substance was thrown in his face before the suspects left the scene on their moped.
This man was also treated in hospital for minor injuries.
Officers are still working to establish whether the incidents are linked. They are appealing to any drivers with a dash cam who were in the vicinity of the following roads between 6.10 and 6.30pm on November 2:
- Blackhorse Road N17
- Ferry Lane N17
- Watermead Way N17
- Hale Road N17
- Hoe Street E17
- Church Hill Road E17
- Walpole Road E17
Anyone with footage they could provide to police, or information about either attack is asked to call 020 3276 3153 or contact via Twitter on @MetCC. If you do not want to give your name, you can contact Crimestoppers 0800 555 111 or give information online at crimestoppers-uk.org.
Two arrests have been made in connection with the Walthamstow incident. Both of those arrested, two males aged 14 and 16, have been released under investigation.