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Singapore prime minister's website defaced by hackers

Roslan Rahman | AFP | Getty Images

The official website of Singapore Prime Minister Lee Hsien Loong was hacked by apparent members of international hacking collective 'Anonymous' late Thursday – the latest episode in the string of cyber-attacks in the city-state.

The hackers posted an image of a Guy Fawkes mask, a well-known symbol for the group, with the words "It's great to be Singaporean today" on a section of the website of the prime minister's office.

The affected section was taken down soon after the hacking incident, which took place at 11.17 pm local time.

(Read more: Car hacking: The next global cyber crime?)

The attack came a day after the prime minister said the government would "spare no effort" to track down and bring to justice those who threaten to attack the country's computer networks.

ICT regulator Infocomm Development Authority of Singapore (IDA) said it is still in the process of investigating the incident.

(Read more: Defense networks vulnerable to cyber attack: Expert)

"We will continue to strengthen all Government websites. This includes the checking and fixing of vulnerabilities and software patching. While this is in progress, visitors to Government websites may experience intermittent problems with access. This will be completed as soon as possible," a IDA spokesperson told CNBC.

On November 1, the website of Singapore's largest newspaper, the Straits Times, was attacked by someone claiming to be from Anonymous.

The attack on the newspaper came just days after the group posted a YouTube video threatening to disrupt key IT infrastructure in Singapore to protest the government's new licensing regulations for news sites.

(Read more: New security threat: Cash register skimmers)

A hacker, who called himself "The Messiah," posted a message on a section of the paper's website saying the newspaper's report on the video was misleading.

Over the past week, the hacktivist group has launched several cyber-attacks across the region including Australian businesses and Philippine government websites.

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