Popocatepetl Volcano Near Mexico City Reawakens

Lava flows from the Popocatepetl volcano after an eruption, seen from Tlamacas, Mexico, early Wednesday, May 15, 2013. The monitoring system of Popocatepetl volcano registered two explosions, yesterday and this early morning. Both events were accompanied by a column of gas and ash, reaching 3 km high and by the emission of incandescent fragments. Popocatepetl has put out small eruptions of ash almost daily since a round of activity began in 1994. (AP Photo/Arturo Andrade) (AP2013)

The Popocatepetl volcano spews ash and steam as seen from Santiago Xalitzintla, Mexico, Sunday evening, May 12, 2013. Seismic activity has increased at the Popocatepetl volcano near Mexico City, leading authorities to alert towns in two central states and the capital. (AP Photo/ Marco Ugarte) (AP2013)

Lava flows from the Popocatepetl volcano after an eruption, seen from Tlamacas, Mexico, early Wednesday, May 15, 2013. The monitoring system of Popocatepetl volcano registered two explosions, yesterday and this early morning. Both events were accompanied by a column of gas and ash, reaching 3 km high and by the emission of incandescent fragments. Popocatepetl has put out small eruptions of ash almost daily since a round of activity began in 1994. (AP Photo/Arturo Andrade) (AP2013)

The Popocatepetl volcano spews ash and steam as seen from Santiago Xalitzintla, Mexico, Sunday evening, May 12, 2013. Seismic activity has increased at the Popocatepetl volcano near Mexico City, leading authorities to alert towns in two central states and the capital. (AP Photo/Marco Ugarte) (AP2013)

The Popocatepetl volcano spews ash and steam as seen from Santiago Xalitzintla, Mexico, Sunday evening, May 12, 2013. Seismic activity has increased at the Popocatepetl volcano near Mexico City, leading authorities to alert towns in two central states and the capital. (AP Photo/ Marco Ugarte) (AP2013)

Cars dusted with volcanic ash sit parked in a casino parking lot in Puebla, Mexico, Tuesday night, May 7, 2013. The Popocatepetl volcano has spewed ash over several cities in the central Mexico state of Puebla, including the state capital. Mexico's National Disaster Prevention Center says there was an eight-hour period of eruptions at the volcano, located east of Mexico City. (AP Photo/Joel Merino) (AP2013)

Volcanic ash coats vehicles at a dealership in Puebla, Mexico, Tuesday night, May 7, 2013. The Popocatepetl volcano has spewed ash over several cities in the central Mexico state of Puebla, including the state capital. Mexico's National Disaster Prevention Center says there was an eight-hour period of eruptions at the volcano, located east of Mexico City. (AP Photo/Joel Merino) (AP2013)