Travelers to two popular European tourist destinations are urged to exercise increased caution during their visits.

The U.S. State Department regularly issues travel advisories related to foreign countries. It recently reissued advisories for Germany and Spain, both rated as Level 2: Exercise Increased Caution.

READ MORE: US State Department issues warning for super-popular travel spot: Terrorist plots continue

Germany’s ranking was due to the potential for terrorist attacks, with tourist locations, travel centers, markets, malls, and hotels, clubs and restaurants all potential targets.

“Terrorist groups and lone actors remain a constant threat in Germany and Europe, attacking people in public locations with knives, small arms, rudimentary explosive devices, and vehicles. Such attacks may occur with little or no warning and target,” the warning noted.

The same concerns exist for Spain, where travelers face threats from terrorism as well as civil unrest. Targets for terrorists are similar – any place where there is a large gathering of people – like places of worship, parks and sporting and cultural events.

Civil unrest also places visitors to Spain at risk. Demonstrations are common in response to political or economic issues, particularly during politically sensitive holidays and during international events, the State Department warned. Visitors are advised to avoid demonstrations and crowds and remain aware of their surroundings.

When traveling to any location, visitors are advised to:

• Be aware of their surroundings when traveling to tourist locations and crowded public venues.

• Follow the instructions of local authorities.

• Monitor local media for breaking events and adjust your plans based on new information.