"It’s very sudden and she didn’t deserve to go like this" a member of the public said.

"They didn’t have a reason to kill her," another added.

And tragic as the incident may be, Singaporeans say it serves as an important reminder to be always vigilant.

"The world is a very dangerous place right now," said a Singaporean.

One man in the street added, "I’m very afraid one day it might happen here".

Sympathies have been pouring in from Internet users as well.

A memorial group page on social networking site Facebook has seen its number of members swell into the hundreds since it was set up early Saturday morning.

Many blogs and forum entries saw users describing their shock, grief and even anger at the news.

But a common thread throughout the posts is the hope that Ms Lo will rest in peace.

And as one blogger aptly said — Ms Lo is more than just a number, she is a person whose absence will be felt.