BOSTON — A Dominican national from New Bedford was one of three men charged Wednesday in connection with a drug trafficking conspiracy that resulted in seizures of over a half-kilogram of fentanyl, federal prosecutors said.

Hilario Yogey Mota-Bernabel, 26, of New Bedford; Miki Michael Mota-Bernabel, 29, a Dominican national residing in Providence, R.I.; and Steven Marshall, 31, of Cape Cod were indicted in U.S. District Court on charges of conspiracy to distribute and possess with the intent to distribute fentanyl and possession with intent to distribute and distribution of fentanyl, according to a news release from the U.S. Attorney's office.

The Mota-Bernabels were charged by complaint and arrested on May 22 and have been in custody since then, while Marshall was arrested by federal authorities on Wednesday, federal prosecutors said. Marshall was previously arrested and charged in state court.

According to court documents, investigators conducted surveillance of Marshall in January and February as he traveled to New Bedford to purchase fentanyl from his supplier, Hilario Yogey Mota-Bernabel, the news release said. After a fentanyl pick-up on March 1, investigators stopped Marshall, searched his vehicle and seized about 125 grams of fentanyl.

Court documents say agents conducted four controlled purchases of approximately 100 grams of fentanyl each from Hilario Yogey Mota-Bernabel in March and April. For one of the controlled purchases, Miki Michael Mota-Bernabel served as the courier, delivering over 100 grams of fentanyl to an undercover agent. Hilario Yogey Mota-Bernabel personally delivered the fentanyl on another occasion.

A search of Hilario Yogey Mota-Bernabel’s residence and stash house resulted in the seizure of over 350 grams of suspected fentanyl, $12,395 in cash and other drug-related paraphernalia, federal prosecutors said. Court documents also indicate the Mota-Bernabels entered the United States illegally.

The charge of conspiracy provides for a sentence of no greater than 20 years in prison, a minimum of three years and up to a lifetime of supervised release, and a fine of up to $1 million, the news release said. The charge of possession with intent to distribute and distribution of controlled substances provides for a sentence of no greater than 20 years in prison, a minimum of three years and up to a lifetime of supervised release, and a fine of up to $1 million.

The Mota-Bernabels will be subject to deportation upon completion of their sentences, federal prosecutors said.

—Curt Brown