"Resolute Support condemns the heinous attack on the Teyban Social and Cultural Center and the Afghan Voice Agency", Faulkner said.
According to a report this month by media freedom group Reporters without Borders, Afghanistan is among the world's most unsafe countries for media workers with two journalists and five media assistants killed doing their jobs in 2017, before Thursday's attack.
On Thursday, more than 40 people were killed and dozens wounded in a suicide bombing at a cultural center in Kabul, Afghanistan.
AFP reporters near the scene of the blast heard a third explosion, suggesting the attack may still be under way.
The attacks shook Kabul a day after the US Marine Forces reported the death of a suspected Taliban leader, Qari Fida Mohammad, which, however, was claimed to have taken place much earlier.
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Sayed Abbas Hussaini, a journalist at the agency, said there appeared to have been more than one explosion during the attack, following an initial blast at the entrance to the compound.
In November, at least one security guard was killed as ISIL fighters stormed Shamshad TV, a private television station.
UNAMA, the United Nations Assistance Mission in Afghanistan, also put out a statement on Twitter condemning the attack. Before Thursday's attack, two journalists and five media assistants were killed doing their jobs this year in the country, according to a report this month by Reporters Without Borders, an organization that works to protect freedom of press.
More broadly, the Afghan capital has come under attack several times in 2017.
Over the years, several worldwide media watchdogs have condemned the freedom and impunity given to the militants and other extremists to conduct such attacks against journalists.