Two women in hijabs suffered a string of injuries including suspected broken ribs and internal bleeding during a racist attack on the London Tube.
The horror assault happened during the evening rush hour at North Ealing station.
British Transport Police (BTP) are investigating after the two victims, one in her 60s and the other in her 30s, were seriously injured.
The women were racially abused before the attacker lashed out.
Both had to be taken to hospital after the incident.
Investigators have released a CCTV image of a woman they believe could help with their enquiries.
In a statement, police said: "The incident happened at 5.30pm on August 23.
"Two women, aged in their 60s and 30s, are reported to have made verbally abused for wearing hijabs.
"They were then attacked. Both were taken to hospital with the older victim suffering possible broken ribs and the younger suffering a black eye, bruising and internal bleeding."
Anyone who knows her is asked to contact BTP by texting 61016 or by calling 0800 40 50 40 and quoting reference number 442 of 23/08/19.
