A Steamship Authority ferry from Vineyard Haven was delayed briefly Thursday afternoon as authorities investigated a bomb threat. No explosives or devices were found and ferries have resumed their regular schedule, a spokesman said.

According to SSA spokesman Sean Driscoll, two bomb threats were emailed to the Steamship Authority offices about 1 p.m. Thursday. The first threatened the Nantucket terminal and the second threatened the Mashpee reservation office. The threats demanded cryptocurrency in exchange for not setting off bombs at the two facilities.

Both the Nantucket terminal and the Mashpee office were searched by SSA staff and local police and determined safe, Mr. Driscoll said.

As a matter of policy, the boat line conducted searches of all other vessels and facilities.

As the ferry Island Home was being searched in Vineyard Haven, an unattended purse was discovered aboard the vessel. Upon further inspection it was determined there was no bomb, and the purse will be returned to its owner. The search caused a brief delay in departure of the scheduled 2:30 p.m. ferry.

SSA officials said they are working with state and federal authorities to determine the source of the bomb threats, which they believe may be related to reports of similar bomb threats across Massachusetts and many other states Thursday. Massachusetts state police are investigating numerous threats received by businesses across the state.

State police said no explosives have been located at any of the threatened facilities.

“We are grateful to our law enforcement partners for their quick response and for the ability to determine that there was no validity to the threat,” SSA general manager Bob Davis in a news release.