Earlier in the day, a fuel truck exploded and killed at least 40 people, the Turkish defense ministry said. Ankara blamed the attack on the Kurdistan Workers' Party (PKK).

"The US renews its call for support and implementation of a nationwide ceasefire in Syria," Ortagus said on Tuesday.

Ankara views the Kurdish-led groups, which are operating in northern Syria, as affiliates of the PKK. To fight them, Turkey — in cooperation with several Syrian opposition groups — has conducted several military operations in Syria, such as the Euphrates Shield and the Olive Branch operations in Afrin.  

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