The U.S. Air Force is airlifting several injured children to the U.S. for medical treatment, while search crews are trying to recover the bodies of victims.
A volunteer firefighter cries after leaving El Rodeo village in Escuintla department, 35 km south of Guatemala City on June 3, 2018, following the eruption of the Fuego Volcano.
As President Jimmy Morales toured the area and met with survivors on Monday, a woman begged him to help her loved ones in Los Lotes.
Among them is Alfonso Castillo, who now resides at a shelter located in the city of Escuintla.
"Nobody is going to be able to get them out or say how many are buried here", said Efraín Suárez, standing amid the smoking holes dotting what used to be the village of San Miguel Los Lotes on the flanks of the mountain. "We will probe the area as many times as necessary", said Sergio Cabanas, the head of Guatemala's disaster relief agency.
The disaster on Sunday was the volcano's biggest eruption in four decades.
The explosions billowed ash more than 5,000m (16,000ft) above sea level, with Guatemala's seismology and volcanology institute warning that there is a moderate flow of risky material down the volcano - with the possibility of a strong flow in some areas.
"We come in support of the people who are really risking their lives for the people who are there", said Gladys Vian, a 56-year-old member of the Catholic parish of Escuintla. "They are taking away our opportunity to say goodbye".
The 3,763-metre volcano erupted early on Sunday, spewing out towering plumes of ash and a hail of fiery rock fragments with scalding mud.
Flower-covered coffins of seven people, who died during the eruption of the Volcan de Fuego, which in Spanish means Volcano of Fire, stand in the main park of the town San Juan Alotenango, Guatemala, Monday, June 4, 2018.
A spokesman for Guatemala's firefighters said that once it reaches 72 hours after the eruption, there will be little chance of finding anyone alive.
It said the lahars could sweep down the mountain laden with concrete, rocks up to a meter (yard) in diameter and tree trunks.
Emergency services continue the search for 192 missing people as the volcano continues to explode. On Tuesday, the volcano sent ash 16,000 feet in the sky.