"We call again on the Taliban to put down their arms and begin peace talks which is the surest way to end the conflict in a peaceful manner," White House Press Secretary Jay Carney said in a statement yesterday.
A British politician of Indian-origin was among 21 people killed in a Taliban suicide attack last evening.
"There is no possible justification for this attack which has killed innocent civilians, including Americans, working every day to help the Afghan people achieve a better future with higher education and economic assistance at the American University, United Nations, International Monetary Fund and other organisations," he said.
"We send condolences to all the victims of the attack and their families and pray for a speedy recovery for those injured," Carney said.
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United Nations Secretary General Ban Ki-moon described the gruesome attack as another sad moment for the international body.
"I extend my deepest condolences to the families of Basra Hassan of the United States, Nasrin Jamal of Pakistan, Khanjar Wabel Abdallah of Lebanon and Vadim Nazarov of Russia. And I also wish all the best and speedy recovery to all the wounded people," Ban told reporters.
"As the United Nations mourns this terrorist attack and its victims we remain committed to work for the peace stability and development of Afghanistan."
"We fully support the transition of Afghanistan toward a better future in peace development and security," Ban said.
Extending deepest condolences to the families and friends of the victims State Department spokesperson, Jen Psaki said the US and its international partners remained steadfast in their commitment to the people of Afghanistan and support their efforts toward peace, reconciliation, and a secure stable and prosperous nation.