A black man who was arrested and led by a rope by two white Texas police officers has sued the US city of Galveston for $1m in damages, his lawyer has said.

Donald Neely was detained for trespassing in August 2019 by two mounted police officers, who handcuffed him, tied a rope to his restraints and led him away.

The image caused outrage, serving as a painful reminder of some of the bleakest moments in America's brutally racist past, including the chaining of enslaved people and lynching of black people in the Jim Crow South in the years after emancipation.

Mr Neely was led on foot several blocks through the centre of the small seaside town in southeast Texas, passing a number of people, some of whom photographed the incident.

One photo in particular quickly went viral on social media and sparked anger and indignation at the degrading treatment of the detained man.

In a suit filed on 7 October, Mr Neely called his treatment by police "extreme and outrageous."

"Neely felt as though he was put on display as slaves once were," the lawsuit said, saying the plaintiff suffered humiliation and fear through the police officers' actions.

Mr Neely is seeking $1m in compensation.

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"What happened to Donald was simply wrong," his lawyer, Julie Ketterman, said. "He wants to do what he can to make sure this doesn't happen to anyone else."

"Donald wants people to know that this lawsuit isn't just about money," she said. "It's about what is right and wrong for all people - whether they are black or white or whether they suffer from mental illness or whether they are homeless or not."

At the time of his detention, Mr Neely, who suffers from mental health issues, was homeless. He was found asleep on the forecourt of a building by the two officers from the mounted patrol unit.

Local media reported at the time that he had been charged with trespassing on several previous occasions.

Galveston Police Chief Vernon Hale who is himself black, said that the technique deployed by the mounted police was one that was taught to officers, but that he had decided to discontinue its use.

He apologised to Mr Neely and said he should have been transported in a police vehicle, but that none were available at the time.

Chief Hale's statement sparked frustration, with some activist groups saying his response was "weak."