The U.S. State Department issued a new alert for U.S. citizens planning to travel to Europe.

They should be aware of a continued threat of terrorist attacks throughout the continent, the alert, that expires on September 1, said.

The document pointed out to recent incidents in France, Russia, Sweden, and Britain, saying that “Islamic State and al Qaeda have the ability to plan and execute terrorist attacks in Europe.”

Reuters quoted a State Department official as saying that the alert was not prompted by a specific threat, but rather recognition of the continuing risk of attacks especially ahead of the summer holidays.