Iran’s Revolutionary Guard announced on Friday that it had destroyed a US early warning radar in Bahrain, marking its first reported strike on a facility in the Gulf kingdom since September.

According to the state-run IRNA news agency, the Guard stated the attack served as a serious warning to Washington and was executed in retaliation for a US strike on a telecommunications pole in the southern Iranian port of Sirik. Bahrain, a staunch critic of Tehran, hosts the US Navy’s 5th Fleet.