June 2 (UPI) -- A ransomware attack disrupted the ticket-buying process for a ferry service to Martha's Vineyard and Nantucket, Mass., on Wednesday.
The Steamship Authority said the cyberattack affected customers' ability to book tickets or change reservations online or by phone, an interruption that's likely to last through Thursday morning.
The service said customers can purchase tickets at terminals, and cash is the preferred method of payment.
"Scheduled trips to and from the islands continue to operate safely as scheduled, although some delays in the ticketing process may occur," the Steamship Authority said on Twitter.
"The Steamship Authority continues to work with our team internally, as well as with local, state, and federal officials externally, to address today's ransomware incident. At this point, we are unable to release or confirm specific details of what occurred."
The company said the attack didn't pose a safety risk because it didn't affect radar or GPS abilities.
Petty Officer Amanda Wyrick, public affairs specialist for the Coast Guard's First District, told CNN the Coast Guard was working with the Massachusetts State Police Cyber Security Unit and the FBI to investigate the cyberattack.
"The incident does not affect the safety of passengers," she said.