Eddy Sanchez, director of the country's seismology and volcanology institute, said the flows reached temperatures of about 700 C.
Lesser amounts of ash fell on Guatemala City, which is 44 kilometers (27 miles) from the volcano. Other videos show residents walking barefoot and covered in muddy residue.
She said: "Not everyone escaped, I think they were buried".
Hundreds of firefighters, police and soldiers are searching for the missing amid the still-smoking lava.
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"The toll was 25 dead as of 9:00 pm (0300 GMT)", the spokesman for the National Coordinator for Disaster Reduction (CONRED) said in a WhatsApp group.
Rescue operations were suspended until 5:00 A.M. (1100 GMT) due to unsafe conditions and inclement weather, said Cecilio Chacaj, a spokesman for the municipal firefighters department.
"It's a river of lava that overflowed its banks and affected the Rodeo village", said Sergio Cabanas, the general secretary of Guatemala's Conred disaster agency, according to Reuters.
The eruption affects an area home to 1.7million people. Among the fatalities were four people, including a disaster agency official, killed when lava set a house on fire in El Rodeo village, Cabanas said.
It was the 3,763-meter (12,346-feet) volcano's second eruption this year. Another victim was found in the streets of El Rodeo by volunteer firefighters, but the person died in an ambulance.
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At an ad-hoc morgue in the town of Alotenango, at least three bodies lay covered with blue sheets.
It added that he said authorities began to send bulletins on the situation starting at 11:30 a.m.
An employee sweeps the entrance of a gas station covered with ash after Guatemala's Fuego volcano erupted violently, in Guatemala City, Guatemala June 3, 2018.
The volcano is located some 40 km southwest of the capital Guatemala City and is close to the colonial city of Antigua, popular with tourists and known for its coffee plantations.
The runway was closed due to the presence of volcanic ash and in order to guarantee passenger and aircraft safety, Guatemala's civil aviation authority said in a tweet.
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