This was an unprovoked and violent incident and it is essential that those responsible are identified and brought to justice.
The five teenage victims were all rushed to hospital with burns injuries following the attack.
It was confirmed that two of them suffered injuries described as ‘potentially life changing’.
One 17-year-old suffered burns to his eyes whilst another, also 17, was left with burns to his mouth and tongue.
He approached the five victims who were waiting on the platform where he held one of his hands behind his back. After a brief dialog with them, he removed his hand from behind his back exposing a bottle. He then squirted an unknown liquid over the victims.
The man re-joined his group of roughly nine friends on the 11.44pm Southend to Barking service.
Investigating officer Detective Sergeant Gail McKemmie said: ‘This was a particularly vicious and alarming assault which has left some of the victims with potentially life changing injuries.