Police were called by paramedics to the junction between Copenhagen Street and Caledonian Road
A man, a woman and a two-year-old boy have been hurt in a suspected acid attack.
A "noxious substance" was thrown at the trio in Islington, north London, at 13:05 BST, Scotland Yard said.
The man suffered "potentially life-changing injuries", although his condition is not thought to be life-threatening. The woman and boy suffered minor injuries.
Officers have yet to identify the substance used.
No arrests have been made.
A Met spokesperson added that police were still working to "establish the full circumstances" of the attack, which happened at the junction of Copenhagen Street and Caledonian Road.
