The incident happened yesterday at Barking station (credit: Ewan Munro)
The victim suffered a head injury in an assault, but officers did not initially say how the injury was caused.
Today, Barking and Dagenham Police has tweeted more information about the stabbing.
Investigators are appealing for witnesses to the attack to get in touch with them.
Tags: Barking, c2c, Public TransportPolice are appealing for witnesses to contact police following a serious assault outside Barking Train Station yesterday evening at approximately 6pm, where a male sustained knife stab injuries to his head. His injuries are not thought to be life threatening or changing. pic.twitter.com/uC3GDCcBJ9
— Barking & Dagenham Police (@MPSBarkDag) October 30, 2019