An animal-welfare group says it has lost faith in Mayor Bill de Blasio's long-standing vow to ban Central Park's horse-drawn carriage industry.

The Coalition to Ban Horse-Drawn Carriages "is very disappointed that Mayor de Blasio reneged on his promise to shut down the inhumane and unsafe horse-drawn carriage trade," the group said in a statement.

About 70 protesters held electric candles Friday night at a silent vigil near the carriage drivers' "hack line" on Central Park South for horses that have died and those that are still working.

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"I think the mayor is afraid," said protester Stacy Szwczyk, 38, of Manhattan. "He is being bullied by the Teamsters union and the City Council."

"I'm furious and upset. I can't understand why these horse-drawn carriages are still allowed. I see these horses in the winter in all kinds of weather and in the summer heat. The horses just don't belong here," she said. "It's a disconnect . . . The tourists can find something else to do like take a pedicab ride."

Another protester, coalition member Elizabeth Forel, said the mayor "reneged on his promise. We worked on his campaign and donated money."

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De Blasio -- boosted in the 2013 mayoral campaign after New Yorkers for Clean, Livable and Safe Streets attacked his then-leading opponent, Christine Quinn, because she supported carriage drivers -- promised when he took office in January 2014 to immediately ban the industry.

But last week, he appeared to shift the responsibility of securing a ban to activists. "What I say to every advocate is: You already have my vote. Go get the votes in the City Council," he said in a WNYC radio interview.

De Blasio "ultimately did not lobby the City Council. Instead, he blamed activists for not doing enough," the coalition said.

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Other opponents of the horse-drawn carriage industry have been less critical of the mayor, though they expressed impatience. Edita Birnkrant of Friends of Animals last week noted that de Blasio still voices support for a ban, but she called his change in tone "disappointing."

"It sort of can feel like a cop-out to say 'Now you get the council' because we have been doing that," she said.

With Maria Alvarez