seriously... tabloids will go all out to fulfill the quota to fill the pages lah, if they can barge into car accident victims funerals, there's nothing stopping them from stealing pics from our websites. yucks
I had experienced before that newpaper used my photos on a car explosion incident for a report and it was downloaded from my facebook..I don't even know which friend of mine passed the link over...
anyway, since you have the watermark, I really think you should contact Lian He Wan Bao. I think you can find their contacts on the paper itself..1st page... they should at least acknowledge your work as a form of respect. you own the photos if you do not take the photos during any paid assignment.
Get paid! coz ppl are paying for the papers... they shdn't take advantage of pgs like that..