It is Guatemala's deadliest volcanic eruption for more than a century. So far officials have identified about a third of the bodies recovered.
"The activity continues and the possibility of new pyroclastic flows in the next hours or days can not be ruled out, so it is recommended not to remain near the affected area", it said.
Dozens of people were seen walking along roadsides carrying children or a few belongings beside paralysed traffic in parts of Escuintla township south of the volcano. As expected, the death toll has since increased, reaching 75.
People praised the police officers on Twitter for the rescue.
On Monday, when the volcano exploded in a massive cloud of ash and molten rock, Hernandez said her brother and sister ran to check on their 70-year-old grandmother on the family's plot of land in the village of San Miguel Los Lotes. That volcano caused pyroclastic flows, which are essentially avalanches of gas, rock, lava and ash that can move at 50 miles per hour or faster.
Everything in the search area was covered in a thick blanket of dust.
The national disaster agency, CONRED, said 192 people remained missing after the disaster and the forensic agency, Inacif, raised the death toll to no less than 75, up from 72.
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Most of Hawaii Volcanoes National Park remains closed due to persistent earthquakes and eruptions of corrosive volcanic ash. Instead, tsunamis or tidal waves, become more serious threats if the size of the natural disaster increases, Preller said.
Volunteers were also distributing humanitarian aid, including clean drinking water, to victims.
Some residents said they had organized themselves to prevent looting that they claimed occurred on the first night of the disaster.
The scenes of devastation were accompanied by heartbreaking stories of whole families that were devastated by the disaster - the biggest eruption from the mountain in four decades.
Pope Francis said he is praying for the dead and for all those affected by a powerful volcanic eruption in Guatemala in which at least 69 people have died.
One More Child's Vice President Andrew Tattrie said members have been keeping the organization up to date with what's happening.
Despite offers of worldwide help from the United States, Mexico and several Latin American neighbours, Guatemalan authorities have not made a request for foreign aid.
"One million seven hundred thousand people are affected, and that number could rise - he said - there is serious damage to infrastructure, especially roads and bridges, so communications are very hard". "We could not get anything out", Castillo said.