World leaders on Wednesday condemned the deadly attack on Pakistan's Bacha Khan University, expressing alarm over another attack on an educational institution in Pakistan.
The UN Secretary-General Ban Ki-moon called for bringing the perpetrators to justice.
UN Deputy Spokesman Farhan Haq said in a statement that the Secretary-general is appalled by such acts of violence and calls for the perpetrators to be swiftly brought to justice, The Express Tribune reports.
In a statement issued by US Department of State, the deputy spokesperson Mark C Toner offered 'deepest condolences' to the victims and their families.
"It is particularly appalling that these terrorists continue to attack educational institutions, targeting Pakistan's future generations," he said.
According to the Dawn, Turkish President Recep Tayyip Erdogan expressed grief over the attack in a phone call to Pakistani Prime Minister Nawaz Sharif, who is in Switzerland on a six-day trip.
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Prime Minister Narendra Modi also condemned the attack that killed 21 people.
"Strongly condemn the terror attack at Bacha Khan University in Pakistan. Condolences to families of the deceased. Prayers with the injured," Prime Minister Modi said in a tweet.
European Union's (EU) High Representative and Vice-President Federica Mogherini said the university strike was "another attack against the innocent, the youth and the very future of Pakistan".