SINGAPORE - One is an Institute of Technical Education (ITE) student, while the other is a middle-aged, small business entrepreneur.
Melvin Teo, 17, and Mr Delson Moo, 42, are the duo believed to have been questioned by the police last week over a recent alleged hacking of an Istana webpage, The Straits Times learnt on Wednesday.
On Tuesday, the police did not identify them but revealed that two suspects were involved in the Istana cyber intrusion, along with two others who allegedly hacked into the Prime Minister's Office (PMO) website on the same day - last Friday.
The two pairs are not connected to each other and did not act in concert but they had "exploited a vulnerability of those sites to display pages from other sources", according to the police.
Checks by The Straits Times found that the pair who are connected to the PMO incident are brothers, Mohammad Asyiq Tahir, 21, and Mohammad Azhar Tahir, 27. Both were arrested and have since been released on bail pending further investigations.
Melvin and Mr Moo were not arrested but continue to assist with investigations into the Istana hacking.
None of the four men is connected to James Raj Arokiasamy, the alleged hacker said to be behind the "The Messiah" pseudonym, according to court papers.
When contacted yesterday, Melvin confirmed that he had been questioned by the police about the Istana hacking, but refused to comment further.
Mr Moo also declined to be interviewed when approached at his office in Ubi Crescent but did not deny that he had been questioned by the police.
The businessman had described himself in a blog as a "doting father" of a boy and said he graduated with an IT degree.
He also said he had a "doctorate in the University of Society" - a self-made title he gave himself for "immersing myself in the workforce since I was a young lad".
Official records show that Mr Moo is a director and shareholder of an online store that sells baby products and women's clothes, and two IT-related firms, all of which are run from the Ubi Crescent office. He and Melvin are believed to be Facebook friends.