"It is a senseless act of unspeakable brutality that has claimed lives of the most innocent of human beings - young children in their school. My heart goes out to everyone who lost their loved ones today. We share their pain & offer our deepest condolences," the tweet added.
Lok Sabha Speaker Sumitra Mahajan too expressed sorrow at the incident.
"This is a gruesome and heinous act. The perpetrators of such acts are enemies of mankind," Mahajan said.
India's external affairs ministry, in a statement, said: "No words will capture the feeling of deep revulsion and horror we feel about this terror attack against innocent children of the Army Public School in Peshawar. It was not just innocent children who have been massacred today, but the very conception of humanity."
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