BOSTON — Authorities are offering a reward of up to $30,000 for information leading to the arrest of a man accused in the execution-style killings of five men at a social club in Boston’s Chinatown neighborhood 30 years ago, officials said Tuesday.

Hung Tien Pham, now 60, and two others are accused of shooting six men at close-range while they played cards on Jan. 12, 1990. One man survived. Pham’s alleged accomplices are serving life sentences after being arrested in China and returned to the U.S., but Pham has never been found.

Joseph Bonavolonta, special agent in charge of the Boston FBI office, urged anyone who knows anything about Pham’s whereabouts to come forward, saying no amount of information is too small or irrelevant.

“We will not rest until Hung Tien Pham is located, arrested and brought to justice,” Bonavolonta said.

Pham, who’s Vietnamese and of Chinese descent, was last seen in Bangkok, Thailand, in the mid-1990s. The FBI says he was known to be a “big spender who liked flashy cars and cognac.”

The FBI has released crime scene photos, an age-progressed photo of Pham, and are launching an international publicity campaign in a renewed effort to track him down.

Authorities have never established a motive in what Bonavolonta called “one of the bloodiest massacres in Boston history.” Pham is also wanted by Boston police for another killing that happened four days before the social club slayings, Bonavolonta said.