Prosecutors have elevated charges against an Edgartown man they said drove the getaway vehicle in the Rockland Trust bank hold-up, charging him on Thursday with also participating in the armed robbery.

Miquel A. Jones, 30, of Edgartown was charged Thursday with masked armed robbery and conspiracy in connection to a Nov. 17 theft of the Rockland Trust bank branch in Vineyard Haven in which three individuals tied up tellers and drove off in a stolen vehicle with an undisclosed amount of money.

Prosecutors initially charged Mr. Jones with being an accessory to the crime, saying he drove a getaway vehicle used in the heist. He was arraigned in Edgartown District Court last week on the accessory charge and is currently being held at the Edgartown Jail on $300,000 bail.

Mr. Jones is scheduled to be arraigned on the robbery and conspiracy charges in Edgartown District Court on Dec. 12, according to court records.

State trooper Dustin Shaw filed a motion to seal a statement of facts in the case for 30 days, arguing that the investigation into the robbery remains ongoing and that any release of police reports to the public could compromise witnesses involved in the investigation, or assist suspects who have fled.

“At the time of this impoundment, investigators have identified other suspects as well as potential witnesses, some of whom are family members, whose involvement and possible knowledge of the facts and circumstances regarding this matter are not yet known,” Trooper Shaw wrote.

In a brief phone call Thursday, Cape and Islands district attorney Michael O’Keefe said that the upgraded charges were the result of developing investigation. He said evidence would be produced in court substantiating the charges, but could not provide evidence Thursday.

“Cases are fluid things, and as the investigation proceeds, more evidence is developed, and more charges can be filed,” Mr. O’Keefe said. 

Few details have emerged about the hold-up beyond what was reported on Nov. 17, when three robbers, armed with handguns and wearing Halloween masks, ambushed bank employees at approximately 8:15 a.m. They tied up staff with duct tape and fled in a stolen vehicle after taking an undisclosed amount of money, dumping the car near the Manuel F. Correllus State Forest.

The heightened charges against Mr. Jones come after state police arrested a second individual in New Haven, Conn. last Friday in connection to the robbery. Omar Johnson, 39, of Canterbury, N.H. was arraigned in Connecticut on Monday on charges of masked armed robbery and conspiracy — the same charges Mr. Jones faces. A Connecticut district court judge set his bail at $250,000.

Mr. Johnson waived extradition during a court proceeding Monday. A New Haven district court clerk confirmed Thursday that the Massachusetts state police had picked him up from court at approximately noon. Mr. Johnson will be arraigned in Edgartown District Court tomorrow, according to the Cape and Islands district attorney’s office.

Both men charged in the crime are Jamaican citizens. 

The investigation into the robbery remains ongoing, according to prosecutors.