On 25 April, Turkey conducted several airstrikes on YPG, YPJ, and PKK facilities in both Syria and Iraq (Sinjar). 40 militants, including five Peshmerga soldiers, were killed at Iraq's Sinjar Mountains, and more than 20 YPG and YPJ fighters were killed on Syria's Mount Karakoc. The Syrian Democratic Forces (SDF) threatened to withdraw from the operation to capture Raqqa if the United States did not take measures to stop Turkey's airstrikes against the group. In response, the US began to patrol the border alongside SDF troops in order to force a ceasefire between its two allies.