One person has been arrested in connection with Thursday's robbery at the Rockland Trust Bank branch on Martha's Vineyard, according to the Cape and Islands District Attorney's Office. The investigation is "ongoing and active," Assistant District Attorney Tara L. Miltimore said in an email to the Globe on Saturday afternoon. Law enforcement officials declined to release further details about the man arrested Saturday night or explain the man's connection to the robbery. He did not provide any further updates on the investigation. (One man arrested in connection with Martha's Vineyard bank robbery) Investigators say three armed suspects raided a Rockland Trust Bank branch in Martha's Vineyard Thursday morning, tied up its employees, and made off with thousands of dollars in cash. (One man arrested in connection with Martha's Vineyard bank robbery) The FBI, Massachusetts State Police, Cape & Islands District Attorney's Office, and Tisbury Police are investigating the robbery, which led to a heavy police response. Several schools were closed, heavily armed officers searched the island and a Falmouth hotel for suspects, and investigators asked for the public's help in solving the case. David Procopio, a spokesman for the Massachusetts State Police, said Saturday that the investigation was active, but did not provide any details. (One man arrested in connection with Martha's Vineyard bank robbery) Procopio said members of the state police Violent Fugitive Apprehension Section were part of the investigation. No one answered the phone at the Vineyard Haven branch where the robbery took place on Saturday morning. A voice message stated that the office is currently closed. A request for comment was not immediately returned. Rockland Trust has said the branch is "temporarily closed" and that no staff were injured. Authorities said the robbery suspects, dressed in Halloween masks and heavy black clothing, fled in a stolen car owned by a bank employee that was found abandoned a few miles away near a state forest in Edgartown on Thursday. , (One man arrested in connection with Martha's Vineyard bank robbery) Geoffrey Freeman, director of Martha's Vineyard Airport, said the suspects are unlikely to have escaped from the plane. Passengers of Cape Air, the only commercial airline, are screened by TSA officers. He said passengers boarding private planes would have to go through detailed background checks. Police searched Steamship Authority wharves on Thursday and armed officers raided a Falmouth Holiday Inn after receiving information that suspects were inside. But officers left the scene without arresting any suspects, and Falmouth Police Chief Ed Dunne said no other locations in the city were being searched as part of the case. On Friday night, police impounded a car on Beach Road in Tisbury and state troopers towed the vehicle behind a flatbed truck. Tisbury Police Sergeant Andrew Sylvia said the car had been impounded while investigators pursued a lead in the case, and that police would interview a man. The island's residents are stunned by a brazen bank robbery during the day and are appalled that the suspects would choose a target located on an island. "Deciding that Martha's Vineyard was a great place to rob a bank is silly," resident Doug Cabral said Friday. "Why would anyone do that?"