New York state Assembly member Zohran Mamdani announced victory after securing an early lead over former New York Governor Andrew Cuomo in New York City's Democratic mayoral primary on Tuesday.
"I am honored to be your Democratic nominee for the Mayor of New York City," Mamdani wrote on social media platform X.
Political veteran Cuomo said he had called Mamdani to congratulate him.
"Tonight is his night. He deserved it. He won," he told supporters.
Mamdani had a significant lead with nearly 90% of the ballots counted, winning some 43% of the vote. While the 33-year-old democratic socialist seems set to run for New York mayor against a Republican rival in November, New Yorkers will have to wait at least a week for official results and the final decision based on the city's somewhat complex voting system.
Many see Mamdani, who is backed by Bernie Sanders and Alexandria Ocasio-Cortez, as a representative of a the new, more progressive wing of the Democratic party.
If Mamdani wins the general mayoral contest in November, he will become New York's first Muslim and Indian American mayor.