A London Overground staff member and passenger were victims of a suspected acid attack near South Tottenham, British Transport Police have confirmed.
The attack happened on a train shortly before 8pm on Wednesday 24 June. Eyewitnesses reported that passengers poured water over the victims' faces in the aftermath of the attack before police and paramedics arrived.
The man and woman were taken to a local hospital where there injuries were described as not serious.
A BTP spokesman said: "We were called to South Tottenham station at 7.57pm to a report of a member of staff and a passenger having had a substance thrown over them while on a London Overground train.
"This did not result in any serious injuries although both the male staff member and the female passenger were taken to a local hospital as a precautionary measure and have since been released.
"Enquiries are ongoing to identify the person responsible, and the nature of the substance."