Two black women were subject to a verbal tirade of racism from a white man on a Long Island Rail Road train in New York.
Video footage saw the man shouting at the two women on the train who he claimed had been talking too loudly.
His insults were strewn with swear words before going on to call one of the women a "f**king monkey".
The incident happened on 19 April onboard a Long Beach-bound train from Penn Station.
According to the New York Post, other passengers heard the man mumbling under his breath before shouting at the women and eventually resorting to racism.
The video reportedly captures part of the incident as the man later got out of his chair and began yelling directly into the woman's face and mimed monkey movements.
The woman who captured the video, Aneesa Janat Rafeek wrote on Facebook.
What this video does not show - him getting up to get in the young woman's face to scream at her more.
It was honestly so disgusting to witness.
The man is said to have eventually moved to another carriage, but Aneesa admitted that she couldn't hear the two women talking before the argument and that it wasn't a quiet carriage.
MTA spokesman Aaron Donovan condemned the actions of the man in a statement and vowed to investigate what happened.
This language is offensive, completely inappropriate, and has no place in our society, let alone on the Long Island Rail Road.
We are actively investigating this report.
On Friday, the woman who was the subject of the abuse, who has been identified as 25-year-old Soraya Orelien, spoke out about what had happened to her.
She is quoted by the New York Post as saying:
I was put in a position where I didn’t know what to do but stand up for myself and not allow this man to belittle me in front of people.
All I did was get on the train. I didn’t expect to be terrorised and threatened by someone.
Clearly, the man is deranged. Hateful. I did nothing to him. Those derogatory words and terms really affected me.
I want to let people know that this happened to an African-American woman.