"This incident exposes the serious decline in our country's morality"

Officers said the main suspect, Shi Haixia, 39, admitted injecting the bottle with tetramine and asking Yang Wenming, 51, to leave it on the street near her competitor’s business, along with school supplies.

She feared that the other school was enrolling more students, in Lianghe village in Pingshan county, in the northern province of Hebei, officers told Global Times.

The bag was spotted by the victims’ grandmother, Ren Shuting, who took it home. The five- and six-year-old girls began foaming at the mouth and convulsing after drinking the yoghurt. One died on her way to hospital; the other died on Wednesday, after a week of treatment. Ren, who also took a sip of the liquid, was admitted to hospital.