Patna, July 17 (IANS) Bihar Education Minister P.K. Shahi Wednesday said there could have been a conspiracy to poison the mid day meal in school that killed 22 children in Saran district.

Shahi told the media that autopsies of the children revealed that organo-Phosphorous had been injected into the meal.

"It is painful that children died after eating the meal. But it can be a conspiracy," he said.

He alleged that the school principal's husband, Arjun Rai, belonged to an opposition party.

"All the food items used to brought from his grocery shop. It is a matter of an inquiry how poison was used," Shahi said.

At least 22 children died after eating mid day meal at a government-run primary school in Dahrmasati Gandawan village in Saran Tuesday.