Israeli intelligence officials have reason to believe that Iran “and other terrorist groups” are working to attack Israeli athletes and visitors at the Paris Olympics, according to Israel’s top diplomat.

“We continue to receive intelligence about the potential threat from Iranian operatives and other terrorist groups planning to target Israeli delegation members and tourists during the Olympics,” Israeli Foreign Minister Israel Katz wrote Thursday in a letter to French officials. “This underscores the critical importance of our joint commitment to ensuring the safety and security of all participants.”