"The United States stands firmly with the government and people of Afghanistan and will work closely with the National Unity Government to bring the perpetrators of this heinous attack to justice", said White House press secretary Sarah Huckabee Sanders.
A suicide attack on the office of the Afghan Voice news agency and a neighboring cultural center in the capital Kabul killed dozens on Thursday, officials and witnesses said.
The explosion took place around 10.30 a.m.in the Qala-e-Nazar area, Nasrat Rahimi, spokesperson for the Ministry of Interior Affairs told Efe news, adding that the victims included women and children.
In May, ISIL claimed an attack targetting an Afghan state television building in Jalalabad that killed six people.
According to them, there were at least two, maybe three suicide bombers who also used grenades in the attack.
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Taliban forces fighting US-led North Atlantic Treaty Organisation forces in Afghanistan have denied any involvement in the attack.
2016 was described as one of the deadliest for journalists in Afghanistan, with the war by the Taliban being the main source of violence.
The ISIS's local affiliate, which first appeared in eastern Afghanistan near the border with Pakistan in early 2015, has become increasingly active and has claimed several recent suicide attacks in Kabul.
It also said that at least 13 journalists and media personnel were killed a year ago while the number was four in 2015.