A reputed Connecticut mobster who has been linked to artwork stolen in 1990 from the Isabella Stewart Gardner Museum in Boston has been arrested on a federal weapons charge.

An attorney for 78-year-old Robert Gentile says his client was arrested Friday in Hartford as he met with probation officials and charged with selling a weapon to an undercover agent.

Gentile was sentenced to prison two years ago in a weapons and prescription drug case that revealed federal prosecutors’ belief that he knows something about the heist of artwork worth an estimated $500 million. He has denied having any knowledge of the robbery.

Support for GBH is provided by:

His attorney, Ryan McGuigan, said Friday’s arrest is likely related to federal authorities’ efforts to compel Gentile to reveal information they believe he has on the artwork.