An Islamic State banner put up on the Montauk Manor website through a hack that also affected other sites was taken down about 6 a.m. Sunday, hotel officials said.
Manager Janice Nessel said the complex had worked with authorities -- she declined to say which ones -- who asked her to leave the banner up until its origin could be traced. She said the hack did not affect customers or compromise any personal information.
"I'm totally relieved," she said Sunday afternoon. "It was just our website server."
The black banner went up on the manor's site Saturday, reading "Hacked by Islamic State (ISIS)" and "We Are Everywhere."
"This is an attack on our Long Island community and an example of the threat posed by cyber terrorism on our shores," Rep. Steve Israel (D-Huntington) said in a statement.
Calls made to the Department of Homeland Security and the FBI were not immediately answered Sunday.
Rep. Peter King (R-Seaford) said Sunday investigators will need to determine whether the hack was carried out by the Islamic State -- also known as ISIS or ISIL -- or just someone pulling a prank. King is a member of the Homeland Security Committee and chairman of the Sub-Committee on Counterterrorism and Intelligence.
In a statement Sunday, Sen. Charles Schumer (D-N.Y.) also said the hack could be a prank.
"In this world of lone wolves you can never be too careful and it should be checked out thoroughly," he said.
King said the hack is a reminder that protecting online security is paramount.
"It is an indication of how serious a cyberthreat is," he said by phone Sunday. "We have to have legislation to fight cyberterrorism. . . . We have to make sure there's more cooperation between the government and the private sector."
King said more cybersecurity legislation is needed, including a Homeland Security Committee proposal that would give the private sector incentives for sharing information about online threats with the government. He said the challenge will be getting the laws passed in the Senate.
"It's hard to get the Senate to focus on this because American people don't see the scope of the threat and they see it as the government trying to take over the Internet," King said.