The United States has carried out a large-scale attack on ISIS bases across Syria, according to a statement from the US Central Command (CENTCOM). The operation took place from 12:30 a.m. to dawn on Saturday, following the killing of two US soldiers and a civilian interpreter in Palmyra last month. CENTCOM said the strikes were aimed at ISIS positions throughout Syria but did not confirm any casualties.

Al Jazeera reported that the operation, named “Operation Hawkeye Strike,” was launched in response to the December 13 ambush in Palmyra. Syria’s Interior Ministry said the gunman involved was a member of the country’s security forces who was being dismissed for extremist views. The US military began the operation on December 19, targeting 70 ISIS infrastructure and weapons sites in central Syria.

By December 30, US forces announced that about 25 ISIS fighters had been killed or captured since the start of Operation Hawkeye Strike. The latest strikes mark an escalation in Washington’s campaign against ISIS in Syria.