According to Thomas Glass, spokesman for the International Committee of the Red Cross, the aid group's "activities are on hold" until next Tuesday or possibly longer.
The organization, he told The Associated Press, needs "to reassess how we can conduct our work" safely following yesterday's attack near the northern town of Shibirghan.
Glass described the assault as the "worst incident" for ICRC in 16 years in Afghanistan. The eight-person ICRC team was delivering livestock materials near Shibirghan, the capital of Jowzjan province, when the gunmen attacked their convoy.
No one has claimed the attack, but the provincial police chief, Rahmatullah Turkistani, said it was likely carried out by Islamic State militants, who have a presence in the area. The Taliban, who have been waging a 15-year insurgency against the Kabul government, denied involvement.
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Earlier today, an Afghan official said NATO drone strikes killed 11 Islamic State militants, including two senior commanders, in the eastern Nangarhar province.
According to Mohammad Hussain Mashraqiwal, a spokesman for the provincial police chief, the two commanders killed in yesterday's strikes were Mohammed Omar Sadiq and Omar Farooq. Six people were also wounded in the airstrikes, he added. US Navy Cpt Bill Salvin, a military spokesman, confirmed that American forces conducted counterterrorism strikes in Nangarhar yesterday, without providing further details. An Islamic State affiliate has emerged in eastern Afghanistan as a rival to the much larger Taliban, and has carried out attacks targeting the country's Shiite minority and security forces.