The decision comes after four Americans were killed in a suicide attack Saturday.
The US Embassy in Afghanistan has closed following deadly insurgent attacks on a German Consulate and an American military base.
In a statement late Saturday, the embassy says it will be "closed for routine services" Sunday "as a temporary precautionary measure."
The unusual decision comes after four Americans - two soldiers and two contractors - were killed in a suicide attack Saturday on the Bagram Airfield near the capital, Kabul.
Two days earlier, insurgents attacked the German Consulate in the northern city of Mazar-i-Sharif, killing six people and wounding more than 100.
The US Embassy in Kabul regularly warns Americans against travel to Afghanistan, where a Taliban-led insurgency is in its 16th year.
The insurgency has become more virulent since most international combat troops withdrew in 2014.
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