"In accordance with U.S. Department of Defense policy, the name of the service members killed in action are being withheld until 24 hours after notification of next of kin is complete", officials said.
Three U.S. service members were killed Tuesday when a roadside bomb detonated next to their vehicle in the embattled province of Ghazni, U.S. military officials said.
A USA civilian contractor was also hurt by the improvised explosive device, the Nato-led mission said in a statement.
Three other US service members and an American contractor were also wounded in the blast.
According to the statement, the injured soldiers have already been evacuated and received medical care. In August, the Taliban stormed the city, located about 100 miles southwest of Kabul, in one of their most significant advances in years, leading to days of heavy fighting.
According to an AP Report, The Taliban claimed responsibility for the deadliest attack on American forces since June 2017.
The Taliban are very active in the province and even kept parliamentary elections from being conducted there last month.
An initial review indicates Sgt. Jasso was likely accidentally shot by our Afghan partner force.
Mexico border crossing closed after migrant protest halted in Tijuana
But Sunday's action affected only the San Ysidro crossing, the busiest port of entry between the United States and Mexico. Brian Schatz, D-Hawaii, wrote that the "tear gas across the border against unarmed families is a new low".
Before that, six US service members were killed in a motorcycle bomb explosion, also claimed by the Taliban, in December of 2015.
The incident Saturday killed Sgt. Leandro Jasso, 25, in Nimruz province's Khash Rod district.
The soldier's death follows a spate of so-called "insider attacks" that have rattled foreign troops tasked with training and assisting Afghan security forces.
This is the second attack in a month targeting United States forces in the region.
The deaths have occurred as the USA has stepped up its efforts to get the Taliban to the negotiating table with the Afghan government.
The deaths bring to 13 the number of US troops killed in the country in 2018.
The US forces are part of the Nato-led Resolute Support Mission in Afghanistan, which has more than 16,000 personnel.