The terrorist had previously hatched plots to attack Changi Airport, the US Embassy, the American Club and the Singapore American School. He had been held under detention, at the Whitley Detention Centre.
On Wednesday afternoon, he escaped when the guard(s) permitted him to use the toilet.

Call the police immediately if you see him.
I urge all bloggers out there to immediately post Mas Selamat's face on their blogs. So that as many people in Singapore as possible will know, and be reminded of what Mas Selamat's face looks like.
It is a very disappointing day for me, to realise how inept and useless the Singapore government has become. To think that we pay the world's highest ministerial salaries to our political leaders. Wong Kan Seng is paid two million dollars per year and he cannot even keep an arrested man under proper lock and key. A terrorist has escaped, for goodness sakes.
I think Wong Kan Seng should resign. Terrorism knows no borders, and Wong Kan Seng's mistake potentially endangers the lives of hundreds, perhaps thousands, of people - not just in Singapore, but in other countries as well. All over the world, elected politicians have been pressed to resign, for much less serious matters.
Okay, that was just some wishful thinking on my part. We know how Singapore works, don't we? It's just another "honest mistake" by our beloved ministers. Lee Kuan Yew will twist and pull Wong Kan Seng's ears in private, I'm sure. But publicly, at least, Wong Kan Seng will ultimately walk away scot-free.
Don't forget - the PAP's good image is at stake. So how could it possibly turn out otherwise? Wong Kan Seng is Deputy Prime Minister, after all. Soon the national spin machine will kick into overdrive to generate a convincing story for the public ....
... as to why our ministers are really still world-class, and deserve their world-class salaries, and the Mas Selamat matter was all just a very honest mistake, and the important thing is that we learn from our mistakes, and not repeat them, (at least not until the next time we make a new honest mistake), and till then, the people of Singapore must be socially cohesive, and be strong, and support their government, as one nation.
You know, the usual crap.
Mas Selamat has managed to run away. But in the end, it will be Wong Kan Seng who makes the really Great Escape.