NEW DELHI: Indian Prime Minister Narendra Modi strongly condemned a “cowardly” attack by Taliban militants Tuesday on an army-run school in neighbouring Pakistan that killed at least 130 people — most of them children.

Modi branded the attack in the northwestern city of Peshawar “a senseless act of unspeakable brutality” and said India shares rival Pakistan's pain.

“Strongly condemn the cowardly terrorist attack at a school in Peshawar,” Modi tweeted.

“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.”

Home Minister Rajnath Singh earlier said the attack, one of the bloodiest in Pakistan in recent years, exposed the “real face of terrorism”.

“I strongly condemn the terrorist attack on a school at Peshawar,” he tweeted.

“This dastardly & inhuman attack exposes the real face of terrorism. My heart goes out to the families of those children who got killed by the terrorists in Peshawar.”

Witnesses described how gunmen went from classroom to classroom, shooting children, after a huge blast shook the Army Public School.

The Tehreek-i-Taliban Pakistan (TTP) claimed responsibility for the attack as retaliation for a major military offensive in the region.