Casino giant Las Vegas Sands Corporation restored its websites Monday afternoon a week after they were hacked.
The hacking affected the web sites for Sands' Bethlehem casino as well as casinos in Las Vegas, China and Singapore.
At one point during the hacking, social security information for employees at the Bethlehem casino was posted on company sites.
The hackers defaced the websites with images condemning comments CEO Sheldon Adelson made about using nuclear weapons on Iran.
Sands took down websites for its Las Vegas, Pennsylvania, Singapore and Macau resorts on Tuesday morning, leaving a checkerboard photo display of property names and phone numbers and a website-maintenance message.
The U.S. Secret Service, FBI and Nevada casino regulators are among agencies investigating, amid reports that company email and employee work computers were also affected.
Officials say the culprits remain unknown.