Hackers claiming to be members of the cybercriminal group Anonymous say they hacked the Singapore Prime Minister's official website.
The attack came just a day after PM Lee Hsien Loong said he would track down the group.
He made the comments after a person claiming to be part of the group posted an online video in which he threatened to hack government websites.
Singapore's internet and phone regulator said part of the website had been "compromised" late on Thursday.
The hackers posted an image of a Guy Fawkes mask - the symbol of the Anonymous group - on the PM's website with the words: "It's great to be Singaporean today."
Earlier this week, Mr Lee said his government would "spare no effort to try and track down the culprits."
"If we can find him, we will bring him to justice and he will be dealt with severely. You may think you're anonymous but we will make that extra effort to find out who you are," he added.
Earlier this month, a hacker - dubbed The Messiah and claiming to be a part of Anonymous - hacked the website of Singapore's main paper, The Straits Times.
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