The U.S. and U.K. on Thursday imposed a new round of sanctions on Iran as concern grows that Tehran’s unprecedented attack on Israel could fuel a wider war in the Middle East, Paralel.Az reports citing Associated Press.

Treasury’s Office of Foreign Assets Control targeted 16 people and two entities in Iran that produce engines that power the drones used in the April 13 attack on Israel. Additionally, the U.K. is targeting several Iranian military organizations, individuals and entities involved in Iran’s drone and ballistic missile industries.

“We will continue to deploy our sanctions authority to counter Iran with further actions in the days and weeks ahead,” Treasury Secretary Janet Yellen said in a statement.

The action comes after U.S. officials earlier this week warned that they were readying new sanctions in response to Iran’s activity in the region and to prevent future attacks.