evidence: Since December 1994, the Popocatepetl Volcano, situated 38 miles southeast of Mexico City, has registered varying levels of seismic activity, including the release of vapor, gas, ash, and incendiary material. Depending on the levels of activity, the Mexican National Center for Disaster Prevention restricts access or closes parks and hiking trails on the mountain's slopes. U.S. citizens planning to hike in the area should be alert to any warnings or signs posted, and should contact the U.S. Embassy for the latest information about seismic activity.