From BBC:

Chinese dumplings which were laced with pesticide and made at least 10 Japanese people ill were probably poisoned on purpose, Japan’s health minister says. The frozen dumplings were contaminated with a highly toxic organophoshate pesticide methamidophos.

“Judging from the circumstantial evidence, we’d have to think that it’s highly likely to be a crime,” Yoichi Masuzoe told reporters. The issue has triggered intensive media coverage and public alarm in Japan.