At least 69 people are known dead and thousands have evacuated from their homes since those living near the volcano were not prepared for the eruption.
Guatemalan authorities warned that the Fuego volcano was showing signs of greater activity on Tuesday night as the death toll from a devastating eruption at the weekend climbed to 75 and almost 200 people remained missing.
Volcanologists recorded the volcano exploding several times an hour Wednesday, which generated a fresh 4,700 metre high column of gray ash.
Prime Minister Benjamin Netanyahu on Tuesday night spoke with Guatemalan President Jimmy Morales, and offered him condolences for the deaths caused by the country's catastrophic volcanic eruption.
Wednesday morning rescuers were concerned about possible dangers posed not only by more volcanic flows but also rain.
Hernandez lost 36 family members in all, missing and presumed dead in the town of San Miguel Los Lotes after the fiery volcanic eruption of the Volcan de Fuego, or Volcano of Fire, in south-central Guatemala. The previous figure was 62, Anadolu Agency reports.
According to Sanchez, Sunday's eruption is the most violent explosion of Fuego volcano since 1974.
The International Federation of Red Cross and Red Crescent Societies said they have released more than 250,000 Swiss francs ($253,446) from its global emergency fund to support frontline emergency efforts.
Residents of several communities gather in a temporary shelter in Escuintla, June 3, 2018, after the eruption of the Volcan de Fuego or Volcano of Fire.
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Tear-jerking pictures show grieving mourners carrying the coffins of seven people who perished after Fuego exploded, burying terrified villagers in an avalanche of molten-lava and ash.
After a drone survey, police managed to reach a farm where a home had been buried and people were believed to have been trapped inside.
Conred said 3,271 people had been evacuated.
Rubin says these clouds of ash and hot gas can not be outrun as they move downslope and spread out to long distances quickly.
Despite offers of worldwide help from the United States, Mexico and several Latin American neighbors, Guatemalan authorities have not made a request for foreign aid.
There are still at least 192 people missing, according to Sergio Cabañas, the executive secretary of Guatemala's National Coordination for Disaster Reduction.
The U.S. Air Force later said it would transport six injured children to the United States for medical treatment.
"Lavas can be deadly and unsafe, but they usually move at a more predictable rate and don't spread out as quickly across the land, so it can usually be escaped from before people lose their life", Rubin said.
Only 17 of the bodies recovered so far have been identified due to the extreme heat that charred their features and burned off fingerprints, and authorities hope other means such as DNA testing can help.