NEW YORK — An investigation of a pair of New York City drug traffickers has resulted in a record seizure of more than 150 pounds of heroin from Mexico worth at least $50 million, authorities said Tuesday.

The Drug Enforcement Administration and Special Narcotics Prosecutor Bridget Brennan called the heroin seizure the largest ever recorded by the DEA in New York state. Agents arrested Jose Mercedes and Yenci Cruz Francisco, both of the Bronx, and recovered $2 million in cash, officials said.

Authorities believe the ring had been receiving similar-size shipments each month from suppliers in Mexico. They say it was a main source of heroin for users in New York City, Connecticut, Massachusetts, Pennsylvania, and Rhode Island.