There were no US casualties in the attack on Herat, a key business hub located in western Afghanistan near the border with Iran, deputy State Department spokeswoman Marie Harf said yesterday.
At least three Afghan guards and one interpreter were killed, Harf said. Earlier, Afghan officials had said one guard was dead and 18 other people wounded.
Harf cautioned that the toll could still change.
The consulate compound, in which US diplomats lived, was closed until further notice, and all US officials relocated to Kabul, she said.
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"After a while, all of these suicide bombers get killed in the attack," Abdul Hameed Hameedi, the deputy security chief of Herat province, told AFP earlier in the day.
Harf said the "consulate's interior compound was not breached."
"Our security measures here were effective," she told reporters.
The Taliban claimed responsibility for the attack.
On September 11, 2012, an attack on the US mission in the Libyan city of Benghazi left four Americans dead, including the ambassador.