British police arrested two teenagers on Friday after five acid attacks in less than 90 minutes across east London left several people with facial burns, including one with horrific injuries.

Two assailants on a moped pulled up alongside a 32-year-old man in the Hackney area of east London at 9.25pm local time on Thursday and threw acid in his face before one of the pair made off with the victim's moped.

In the next hour-and-a-half, three other men across Hackney and one in the neighbouring borough of Islington had corrosive substances hurled at them, police said.

After one of the robberies in Hackney, a man was left with facial injuries described by police as "life-changing".