"The United States condemns in the strongest possible terms today's horrific attack on the Army Public School in Peshawar, Pakistan," the press release stated.
The United States reiterated its commitment to support the government of Pakistan "in its efforts to combat terrorism and extremism and to promote peace and stability in the region," according to the White House.
"By targeting students and teachers in this heinous attack, terrorists have once again shown their depravity. Our hearts and prayers go out to the victims, their families, and loved ones," the press release stated.
On Tuesday morning, members of the Pakistani Tehrik-i-Taliban group attacked a public school in Peshawar, taking up to 500 students and staff hostage. The attack resulted in the death of more than 130 people, the victims being mostly children. According to the Pakistani newspaper Dawn, all six of the terrorists were killed by the country's Special Service Group (SSG) troops.
According to media reports, the Taliban said the attack was carried out in retaliation for recent advances made by the Pakistan Army against the extremist group.
Pakistani Prime Minister, Nawaz Sharif, announced three days of nationwide mourning for victims of the terrorist attack.