US casino giant Las Vegas Sands Corp has restored its websites a week after they were hacked.
The Las Vegas-based company pulled down its sites on February 13 after hackers defaced them with images condemning comments CEO Sheldon Adelson had made about using nuclear weapons on Iran.
Sands restored the websites on Monday afternoon.
Spokesman Ron Reese says the company first became aware of the hacking on February 12, when company email went down.
The hacking affected Sands' corporate website, the sites for casinos in Pennsylvania and the Italian-themed Venetian and Palazzo on the Las Vegas Strip as well as casinos in China and Singapore.
Sands owns the world's largest casino, in the Chinese gambling enclave of Macau.
The company's net income was $US2.31 billion ($A2.57 billion) last year.
Reese didn't say whether internal systems were also operating again.
