Rescuers search for the victims of Mount Merapi eruption in Argomulyo, Yogyakarta, Indonesia. A deadly surge of blistering gases cascaded down the slopes of Indonesia's most volatile volcano, torching houses in one mountainside village. –AP Photo/Trisnadi

YOGYAKARTA: The tiny hospital at the foot of Indonesia’s most volatile volcano is struggling to cope with victims brought in after the mountain’s most powerful eruption in a decade. Some have clothes, blankets and even mattresses fused to their skin.

With few beds and the only burn unit it town, doctors are forced to turn some people away.

A surge of searing gas raced down the sides of Mount Merapi on Friday, smothering entire villages as it killed or seriously burned those caught in its path. The death toll after the volcano’s largest eruption in a century soared to 122.

The worst hit village of Bronggang lay nine miles from the fiery crater, just on the perimeter of the government-delineated ‘‘danger zone.’’ Crumpled roofs, charred carcasses of cattle and broken chairs — all layered in white ash and soot — dotted the smoldering landscape.

The zone has since been expanded to a ring 12 miles from the peak, bringing it to the edge of the ancient royal capital of Yogyakarta, which has been put on its highest alert. Poor visibility from dust showers forced closed the city’s airport for a second day Friday.

Officials say the biggest threat to residents is the Code River, which flows from the 9,700-foot mountain into the heart of the city of 400,000 and could act as conduit for deadly volcanic mudflows that can race at speeds of 60 mph.

The river is already clogged with cold lava, mud, rocks and other debris.

Sri Sucirathasri said her family had stayed in their Bronggang home Thursday night because they hadn’t been told to leave.

They awoke in the dark as the mountain let out thunderous claps and tried desperately to outrun the flows on a motorbike. Her mother, father and 12-year-old sister, Prisca, left first, but with gray ash blocking out any light, they mistakenly drove into — rather than away from — the volcano’s dangerous discharge.

The 18-year-old Sri went looking for them when she heard her mother’s screams, leaving at home an older sister, who died when the house was engulfed in flames.

‘‘It was a safe place. There were no signs to evacuate,’’ said Sri, a vacant gaze fixed on Prisca, whose neck and face were burned a shiny ebony, her features nearly melted away.

Their mother was still missing. Their father, whose feet and ankles are burned, was being treated in another ward.

‘‘I don’t know what to say,’’ she whispered when asked if she blamed officials for not warning the family. ‘‘Angry at who? I’m just sad. And very sick.’’

Merapi’s latest round of eruptions began Oct. 26, followed by more than a dozen other powerful blasts and thousands of tremors.

With each new eruption, scientists and officials have steadily pushed the villagers who live along Merapi’s fertile slopes farther from the crater. But after initially predicting earlier eruptions would ease pressure under the magma dome, experts who have spent a lifetime studying the volcano now say the don’t know what to expect.

Scientists can study the patterns of volcanoes, but their eruptions are essentially unpredictable, as Merapi’s increasingly intense blasts have shown.

Towering plumes of ash rained dust on windshields of cars 300 away Friday, although rain near the mountain in the afternoon turned much of it to sludge. Bursts of hot clouds occasionally interrupted aid efforts, with rescuers screaming, ‘‘Watch out! Hot cloud!’’

The latest eruption released 1,765 million cubic feet of volcanic material, making it ‘‘the biggest in at least a century,’’ state volcanologist Gede Swantika said as plumes of smoke continued to shoot up more than 30,000 feet.

Soldiers pulled at least 78 bodies from homes and streets blanketed by ash up to a foot deep, raising the overall toll to 122, according to the National Disaster Management Agency.

With bodies found in front of houses and in streets, it appeared that many of the villagers died from the blistering gas while trying to escape, said Col. Tjiptono, a deputy police chief.

‘‘The heat surrounded us and there was white smoke everywhere,’’ said Niti Raharjo, 47, who was thrown from his motorbike along with his 19-year-old son while trying to flee.

‘‘There was an explosion … and it got worse, the ash and debris raining down,’’ he said from a hospital.

The living were carried away on stretchers following the first big explosion just before midnight.

More than 150 injured people — with burns, respiratory problems, broken bones and cuts — waited to be treated at the tiny Sardjito hospital, where the bodies piled up in its morgue, and two other hospitals.

‘‘We’re totally overwhelmed here!’’ hospital spokesman Heru Nogroho said.

The facility is limited to 10 beds, though, and it turns away any patient without facial burns or whose body is burned less than 40 per cent, according to Sigit Priohutomo, a senior official at Sardjito.