Popocatepetl is located about 34 miles (55 kilometers) east of the capital, Mexico City. More than 30 million people live within sight of the volcano.
In an increase of activity the volcano registered "62 expulsions of medium intensity, with the emission of water vapor, gas, ashes and glowing rocks," between Thursday night and Friday, said a statement from the National Center of Disaster Prevention.
Authorities raised the alert level Monday to five on a seven-point scale, extending a security radius around the 5.452-meter (17,887-feet) volcano but stopping short of starting evacuations from nearby communities.
Concerns are growing that should a larger eruption occur huge quantities of ash could be dumped on one of the world's largest metropolitan areas, potentially causing chaos for Mexico City's busy air traffic.
Residents in the nearby town of Santiago Xalitzintla said the volcano was now constantly rumbling.
"There was a strong humming sound all night... it's roaring," said Alvaro Perez.
Another resident said her family was scared of what might happen next.
"My smallest son, who is four years old, was woken up by the roar during the night," said Sofia Lopez. "'Mum, are we leaving now?' he asked me. I told him that it was OK, but the truth is that we're very scared."
NOAA's Geostationary Operational Environmental Satellite, GOES-13, captures visible and infrared images of weather over the eastern U.S. every 15 minutes, and spotted an ash and gas cloud streaming from the volcano over several hours during the morning of April 18, 2012.
The short, four second black and white video covers several hours and shows the volcano's ash blowing to the east, and over the central state of Puebla.
On the ground, officials in Puebla have prepared temporary shelters for possible evacuations and locals were wearing face masks to protect their lungs from ashes in a populous area around the volcano.
Read more at Discovery News
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