NEW YORK — Amazon abruptly dropped plans Thursday for a big new headquarters in New York that would have brought 25,000 jobs to the city, reversing course after politicians and activists objected to the nearly $3 billion in tax breaks promised to what is already one of the world’s richest, most powerful companies.

“We are disappointed to have reached this conclusion — we love New York,” the online giant from Seattle said in a blog post announcing its withdrawal.

The stunning move was a serious blow to Gov. Andrew Cuomo and Mayor Bill de Blasio, who had lobbied intensely to land the project, competing against more than 200 other metropolitan areas across the continent that were practically tripping over each other to offer incentives to Amazon in a bidding war the company stoked.

Cuomo lashed out at fellow New York politicians over Amazon’s change of heart, saying the project would have helped diversify the city’s economy, cement its status as an emerging tech hub and generate money for schools, housing and transit.

“A small group of politicians put their own narrow political interests above their community,” he said.

The swift unraveling of the project reflected growing antipathy toward large technology companies among liberals and populists who accuse big business of holding down wages and wielding too much political clout, analysts said.