Luigi Mangione's defense calls Manhattan DA's July trial date "unrealistic" as accused assassin faces parallel federal court proceedings in September.

The Minnesota man was charged with impersonating an FBI agent after he showed up at a federal prison in New York City claiming to have a court order to release Mangione.

A man was arrested on Wednesday for allegedly impersonating an FBI agent and trying to free Luigi Mangione, according to federal court filings and a law enforcement source.

A man claiming to be an FBI agent appeared at a federal jail on Wednesday night and told officers he had a court order to release Luigi Mangione, The Associated Press reports.

A Minnesota man was arrested Wednesday night for impersonating an FBI agent in a failed attempt to free Luigi Mangione from a New York City federal prison, according to a new criminal complaint. The suspect,

Mark Anthony Anderson, 36, from Minnesota, allegedly made the attempt at the Metropolitan Detention Center in Brooklyn on Wednesday evening.

A man was arrested for trying to break Luigi Mangione out of jail with a pizza cutter while impersonating an FBI agent.

Luigi Mangione's time in jail awaiting trial for allegedly murdering UnitedHealthcare's CEO has been marked with another shocking incident involving a fan, RadarOnline. com can reveal.

Mark Anderson was arrested and charged for impersonating a federal officer after allegedly attempting to free Luigi Mangione from prison on Jan. 28, law enforcement sources told CNBC.