I suspect that a dirty DBS staff anyhow use my mother's
funds!
My mum has a unit trust account in DBS and she does her
transections at Bedok branch. Today when she attempted to sell some
of those unit trusts, the bank told her that the transection was
denied.
The reason? The bank said that her unit trusts were "ear-marked",
which is simply a nice way of saying that it was withdrawn and used
as a loan. My mum's unit trust account is now empty!
And when the bank checked, the transection was done at DBS hougang
branch but my mother did not go there before! She doesnt even know
where the DBS hougang branch is.
Someone working at DBS must have secretly siphoned out my mother's
funds for his/her god-damned personal use. 
It is illegal right?
My mother is demanding the bank for an explanation and they gave
assurances that they are investigating. Hopefully, these are not
just empty words. 
If I report the matter to the police, will they be of use? Or are
there other organisations which can investigate financial theft for
individual cases?
*This post is not against DBS as a bank but against a possible
cheater who has anyhow earmarked other people's fund for personal
use