WASHINGTON (AP) — Americans planning to attend the Winter Olympics in Sochi, Russia, should be vigilant about their security due to potential terrorist threats, crime and uncertain medical care, the State Department advised Friday.

In a travel alert, the department said it was not aware of specific threats to U.S. interests related to the Games that begin next month. But it said large events like the Olympics are “an attractive target for terrorists” and Americans should be aware of their surroundings and take common-sense precautions to stay safe, notably on public transport.