Earlier this month in Oslo, Malala Yousafzai spoke with cautious hope about the future in her native Pakistan after accepting the Nobel Peace Prize.

On Tuesday, the 17-year-old said she was “heartbroken” by the latest tragedy: Taliban gunman storming an army school in Peshawar and roaming the auditoriums and classrooms in a killing spree that claimed at least 141 lives. Nearly all the dead were, like her, teenage students.

“Innocent children in their school have no place in horror such as this,” said Yousafzai, who is now studying in Britain after her long recovery from wounds inflicted by a Taliban gunman in 2012 in Pakistan’s Swat Valley. “I condemn these atrocious and cowardly acts.”

“I am heartbroken by this senseless and cold blooded act of terror in Peshawar that is unfolding before us … I condemn these atrocious and cowardly acts and stand united with the government and armed forces of Pakistan,” she added.

She said that she joins the world in mourning the children killed -- “my brothers and sisters,” she called them.

“But we will never be defeated,” said Yousafzai, who won this year’s peace prize for her advocacy for children’s education.

Kailash Satyarthi, an Indian rights activist, who was awarded a separate peace prize this year, called the Taliban attackers in Peshawar “enemies of Islam.”

"The terrorists who have committed this heinous crime are the enemies of humanity. They are the enemies of Allah, they are the enemies of society and they are the enemies of Islam,” he said at a meeting in India. “I pray that somewhere in their hearts, their conscience awakens.”