The call came a day after Turkey launched “Operation Olive Branch,” an offensive by Ankara’s troops and allied Syrian rebels against the Kurdish People’s Protection Units (YPG) in the town of Afrin.
“We urge Turkey to exercise restraint and ensure that its military operations remain limited in scope and duration and scrupulous to avoid civilian casualties,” State Department spokeswoman Heather Nauert said in a statement.
“We call on all parties to remain focused on the central goal of defeating” Daesh, Nauert said.
The YPG has been a key US ally in the war against Daesh, helping to drive the rebel group from swaths of Syrian territory, including its stronghold Raqqa.
But Ankara considers YPG fighters to be “terrorists” linked to the Kurdistan Workers’ Party (PKK), which has been engaged in a separatist struggle against the Turkish state since 1984.
A Britain-based monitoring group and a YPG spokesman both said that Turkish air raids killed eight civilians in northern Syria on Sunday.
On Saturday, the YPG’s Birusk Hasakah told AFP that a Turkish bombardment had killed 10 people, including seven civilians.
Turkish Foreign Minister Mevlut Cavusoglu said Sunday that claims of civilian casualties from the offensive were untrue.