OSAKA — Osaka prosecutors questioned two former top officials of Snow Brand Milk Products Co. in connection with the massive outbreak of food poisoning last summer caused by milk products made at its Osaka plant, prosecution sources said Monday.

Questioned were former President Tetsuro Ishikawa, 67, and former Senior Managing Director Hiroshi Soma, 62, the sources said.

Ishikawa's case was sent to the Osaka District Public Prosecutors Office in March on suspicion that he aggravated the gravity of the situation by delaying the announcement about the tainted products, resulting in injury.