Muhammed Nawshad Kamal, 32, was working in the Walthamstow area of east London on Thursday evening when he was approached by two teenagers on a scooter who tried to steal his scooter, the Independent reported.
During the course of the attack the victim was repeatedly sprayed in the face with acid.
Kamal, who cops said inhaled "a corrosive chemical", was fighting for his life hospital, it said.
"This was an innocent man going about his work as a delivery driver, who may never see again," he said.
He is in an induced coma at the moment, he said.
"They tried to take his moped (scooter) from him, were constantly asking for his keys, threatening him and then they've reached into the carrier bag on their moped and have retrieved the corrosive substance and sprayed that on our victim's face."
A 14-year-old boy was arrested on suspicion of causing grievous bodily harm and released under investigation, while police arrested a 16-year-old boy on Saturday night on the same charge, the report said.
The attack comes days after Scotland Yard Commissioner Cressida Dick said she was shocked at the 'extraordinary' surge in moped crime.
In the year to September there were more than 19,385 'moped-enabled' crimes in the capital, an average of 53 a day.
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