A mother and daughter were walking home and chatting in Spanish after having dinner out in a Boston neighbourhood.

Suddenly, two women attacked them on the street – punching, kicking and biting them, according to the mother.

“This is America! Speak English!” yelled the women, the mother said.

The daughter, 15, is still in a neck brace two weeks after the alleged attack.

Prosecutors have now filed hate crime charges against two women – Jenny Leigh Ennamorati and Stephanie M Armstrong, both 25 years old and from Revere in Suffolk County, Massachusetts – in connection with the alleged assault on 15 February in East Boston.

The episode sparked outrage in the city, which has a history of racial strife and violence. In East Boston, more than half of the residents are Latino, and more than half were born in another country.

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“There is no place for hatred or bigotry in Suffolk County,” said Rachael Rollins, the county district attorney. “The sense of entitlement and privilege these defendants must have felt to utter these hateful and racist words, and then to physically attack a mother and her child for laughing and speaking Spanish is outrageous and reprehensible.”

The mother asked to be identified only as Ms Vasquez to protect the identity of her daughter and to prevent her from being harassed.

Ms Vasquez, 46, said on Saturday she was still having nightmares about the assault.

“This was terrible – terrible,” said Ms Vasquez, a South American immigrant who has lived in East Boston for five years. “Nobody expects to be walking down the street and attacked.”

Ms Ennamorati and Ms Armstrong are scheduled to appear in court on 9 March on charges that include two counts each of violation of constitutional rights with bodily injury, and two misdemeanour counts each of assault and battery.

There was no answer on Saturday to calls made to phone numbers listed for either of the women, and it was not immediately clear if they had lawyers.

Prosecutors said both women told the police they had been drinking. A police report indicated that Ms Ennamorati and Ms Armstrong believed that Ms Vasquez and her daughter had been making fun of them in Spanish, which they could not understand.

They began shouting at the mother and daughter before attacking them, the report stated.

A lawyer for Ms Vasquez, Ivan Espinoza-Madrigal, said law enforcement officials filed charges only after the mother and daughter held a news conference on Monday to draw attention to the case.

Mr Espinoza-Madrigal said Ms Vasquez had spoken to the police on the night of the attack, but then sought his legal help because she was frustrated with the slow response.

“Based on the details outlined in the initial police report that was done at the site of the incident, this should have been immediately flagged as a hate crime,” said Mr Espinoza-Madrigal, executive director of Lawyers for Civil Rights, a nonprofit based in Boston that fights discrimination on behalf of people of colour and immigrants.

“The fact that it was not raises serious questions about the process that law enforcement is using to identify hate crimes and resolve them,” he added.

Mr Espinoza-Madrigal said that after the news conference, his office heard from other Latino victims who had experienced racial violence in East Boston, who said that their cases were not being properly investigated by the police.

East Boston’s foreign-born population has risen to more than 50 per cent over the past several decades, and its Latino population has increased to 58 per cent in 2015 from 1 per cent in 1970, city data shows.

“This family’s experience was not an isolated event,” said Janelle Dempsey, another lawyer from Lawyers for Civil Rights. “Acts of racism and xenophobia are alarmingly common in East Boston.”

Detective Sergeant John Boyle, a Boston Police spokesperson, said on Saturday that investigators had responded to the attack on Ms Vasquez and her daughter on the night.

“We referred this case to our own civil rights unit, which actively worked the investigation right away,” he said.

Mr Boyle added that residents in immigrant-dense neighbourhoods like East Boston should report crimes, regardless of their immigration status.

Boston is a sanctuary city, limiting the ability of local law enforcement to cooperate in handing over immigrants for deportation to the federal authorities.

“If they are undocumented, we will treat them as a victim and nothing else,” Boyle said. “No one should be afraid to come to the police if they are a victim of a crime.”

Mr Espinoza-Madrigal said the attack, which happened at about 8pm near a train station, was captured on CCTV from a nearby business.

The video shows a woman pointing and appearing to yell before punching another woman. Several people standing nearby also appear to be pushing and shoving one another before police officers arrived.

The district attorney said several bystanders also stepped in to help.

Ms Vasquez said that despite being badly shaken by the assault, she hoped the charges would encourage other immigrants, even if they are unauthorised, to report crimes to the police.

“No one,” she said, “has the right to attack us.”