Melamine, which is high in nitrogen, was used to fool the test that measures protein content of the milk. There are now 6,244 babies sickened by melamine-laced milk, with 3 deaths and 158 with acute kidney failure.
Fonterra of New Zealand, which owns part of Sanlu, the company at the center of the scandal, also recalleda batch of Anmum Materna, which is produced under license by Sanlu and sold in China as supplement for pregnant women. (I think there's an Anmum brand sold in the Philippines, I hope there's no Chinese-made component in those. BFAD, are you checking this?)
The chemical was also found in Yili brand of yoghurt, in Hong Kong.