"It is very sad to know about yesterday's (Tuesday) incident where food poisoning has taken place and 20 children and the cook have passed away and another 21 are hospitalised. We have taken serious note of what has happened," the minister told reporters.
The minister also added that a senior official who looks after the mid-day meal programme is in Bihar for a first hand information.
"It looks like contaminated food...but we are awaiting the forensic report, which will be out later today (Wednesday) and we will know the reason then why the food was contaminated," the minister said.
Twenty dead children were buried near the school.
A case has been registered against the school's headmistress Meena Devi and other teachers.