"London Ambulance Service and London Fire Brigade have attended.
"A number of people have been reported injured at different locations - believed to be six people. We await further details.
"One male has been arrested on suspicion of GBH. Officers remain on scene. A cordon is in place. Enquiries continue."
The attack focused around the 1970s shopping mall, the Stratford Centre, which is next to the bus station and a walk through to the Tube station.
Witnesses at the scene said an argument broke out among a group of people.
A man who gave his name as Hossen, 28, a Burger King assistant manager, said he saw a victim and his friend, a known local homeless man, run into the fast food outlet bathroom "to wash acid off his face".
He said: "There were cuts around his eyes and he was trying to chuck water into them."
Nate Higgins, who saw the emergency services arriving at the scene, told MailOnline: "There were a lot of police, a lot of fire engines and a lot of ambulances.
"As I was leaving there were still more and more coming down the road. I was in the shopping centre when it happened and as I was coming out I saw them all arriving.
"There were at least 10 different vehicles and it didn't seem to be a settled thing."
Another witness Harry Green, 19, got off the tube in the moments after the incident.
He told MailOnline he witnessed the "chaotic aftermath".
"There were police officers with dogs everywhere, the whole station was at a standstill," she said.
"It was worrying as it was obvious something had just happened. It was just chaos."
"As we stepped off the tube there were dozens of people giving statements to officers looking distressed as though something had just happened.
"We didn't see anyone injured but there were lots of ambulances on the scene but it seems they were taken away pretty promptly.
"We witnessed the aftermath, the emergency services seemed to have responded very quickly. There was a lot of confusion around, a lot of people didn't know what had happened or why they were stuck in the station."
WHERE HAVE THE MOST RECENT ATTACKS TAKEN PLACE?
(Source: News.com.au)
Monday June 19: The Only Way Is Essex star Ferne McCann's ex-lover Arthur Collins denied carrying out an acid attack in a nightclub in Dalston, East London, which left two revellers partially blinded.
Wednesday June 2:1 Two cousins were allegedly doused in acid while sitting in their car in Beckton, East London, on June 21.
Tuesday, July 4: A heavily pregnant woman reportedly had acid thrown over her while her partner suffered injuries to his face in an alleged attack in East London.
Thursday July 13: A 16-year-old boy who was arrested in connection with a horrific spate of five acid attacks across London is charged with 15 offences.
Friday July 14: A biker reportedly had a "noxious substance" thrown in his face during a failed bid to steal his bike in Dagenham, East London.
Sunday July 16: A female paramedic was said to have had chemicals thrown in her face by masked thugs as she responded to a 999 call in Tottenham Hale, North London.
Tuesday July 18: Police were hunting a thug allegedly caught on CCTV hurling cleaning fluid into a face of a drinker outside The Chalice pub in Dickens Heath, West Midlands.
Tuesday July 25: Witnesses described the desperate screams of two young men who were targeted in what is believed to be an acid attack in Bethnal Green, East London, with a man since charged.
Monday July 31: Shocking footage shows a moped gang fleeing and being chased by shoppers after a suspected acid attack outside Harrods in central London.
Tuesday August 8: Jealous schoolgirl Emily Bowen, 18, was jailed for 21 months after pouring drain cleaner into fellow orchestra member Molly Young's viola case in an attack which left her scarred for life.
Tuesday August 8>: A man had to be hosed down by firefighters after a suspected acid attack just yards from Kensington Palace in West London.
Saturday August 26: A man and woman were attacked by a noxious substance in the early hours in Daventry, Northamptonshire.
Sunday August 27: There were shocking scenes at the Notting Hill Carnival when revellers were forced to flee after a liquid thought to be acid was thrown into the crowd.
Saturday September 23: Tonight's acid attack, said to be carried out by a gang across the Stratford area.
- with Daily Telegraph, news.com.au
