"The patrol was conducting a partnered mission with the Afghan National Army when a personnel-borne IED [improvised explosive device] detonated," the release said. "All of the wounded are listed in stable condition."
The mission noted that the wounded are receiving treatment at the US military hospital at Bagram Airfield.
Another explosion took place in Kandahar on Wednesday, with the attacker targeting a security forces convoy carrying international troops.
NATO withdrew its military contingent from Afghanistan in 2014, replacing it with a non-military Resolute Support mission. Its objective is to train, advise and assist Afghan National Defense and Security Forces in preserving peace and stability in the country. However, in 2015, Islamic State terrorist group (IS, outlawed in Russia) expanded its presence in Afghanistan, destabilizing the situation there.