A major volcanic eruption in Indonesia shrouded a large swath of the country's most heavily populated island in ash on Friday, triggering the evacuation of more than 100,000 people and the closure of three international airports after killing two people.

The explosive overnight eruption of Java island's Mount Kelud could be heard up to 200 kilometers (125 miles) away, Indonesia's disaster agency said.

The ash cloud reached 30 kilometers (18 miles) into the atmosphere and fell to earth in towns and cities across the region, including Surabaya, Indonesia's second-largest city, and even farther afield in Yogyakarta, where motorists switched on headlights in daylight.

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Kediri, a normally bustling town about 30 kilometers (19 miles) from the mountain, was largely deserted as residents stayed indoors to avoid the choking ash.

"The smell of sulphur and ash hung so thickly in the air that breathing was painful," said Kediri resident Insaf Wibowo.

Shape Created with Sketch. In pictures: Mount Kelud - one of the most dangerous volcanoes in Indonesia erupts Show all 10 left Created with Sketch. right Created with Sketch. Shape Created with Sketch. In pictures: Mount Kelud - one of the most dangerous volcanoes in Indonesia erupts 1/10 Indonesia A man wears a mask as he rides a becak, a kind of rickshaw, on a road covered with from Mount Kelud in Yogyakarta 2/10 Indonesia A man covered with ash from Mount Kelud is seen on his motorcycle in Yogyakarta 3/10 Indonesia Indonesian soldiers evacuate ash covered residents in Malang, East Java province moments after Mount Kelud, considered one of the most dangerous volcanoes on densely populated Java, erupted. Hundreds of thousands of Indonesians were ordered to evacuate and three international airports were closed after a volcano on the main island of Java erupted spectacularly, hurling red-hot ash and rocks 4/10 Indonesia Indonesian airport personnel inspect volcanic ash covered planes and the airport of Yogyakarta about 200 kilometers (124 miles) west of the Mount Kelud volcano in East Java province following its eruption 5/10 Indonesia The runway of Adi Sucipto International airport is covered with ash in Yogyakarta 6/10 Indonesia Indonesian workers cover the famous Borobudur temple to protect it from volcanic ash from the Mount Kelud volcano eruption in Magelang, Central Java 7/10 Indonesia A residential area is covered with ash from the Mount Kelud volcano, in Yogyakarta 8/10 Indonesia A housing complex is seen covered with ash from Mount Kelud, in Yogyakarta 9/10 Indonesia Indonesian students walk on a street covered with volcanic ash following an eruption of Mount Kelud, in Yogyakarta 10/10 Indonesia A women walks on a road covered with volcanic ash following an eruption of Mount Kelud, in Yogyakarta 1/10 Indonesia A man wears a mask as he rides a becak, a kind of rickshaw, on a road covered with from Mount Kelud in Yogyakarta 2/10 Indonesia A man covered with ash from Mount Kelud is seen on his motorcycle in Yogyakarta 3/10 Indonesia Indonesian soldiers evacuate ash covered residents in Malang, East Java province moments after Mount Kelud, considered one of the most dangerous volcanoes on densely populated Java, erupted. Hundreds of thousands of Indonesians were ordered to evacuate and three international airports were closed after a volcano on the main island of Java erupted spectacularly, hurling red-hot ash and rocks 4/10 Indonesia Indonesian airport personnel inspect volcanic ash covered planes and the airport of Yogyakarta about 200 kilometers (124 miles) west of the Mount Kelud volcano in East Java province following its eruption 5/10 Indonesia The runway of Adi Sucipto International airport is covered with ash in Yogyakarta 6/10 Indonesia Indonesian workers cover the famous Borobudur temple to protect it from volcanic ash from the Mount Kelud volcano eruption in Magelang, Central Java 7/10 Indonesia A residential area is covered with ash from the Mount Kelud volcano, in Yogyakarta 8/10 Indonesia A housing complex is seen covered with ash from Mount Kelud, in Yogyakarta 9/10 Indonesia Indonesian students walk on a street covered with volcanic ash following an eruption of Mount Kelud, in Yogyakarta 10/10 Indonesia A women walks on a road covered with volcanic ash following an eruption of Mount Kelud, in Yogyakarta

Some residents were shoveling the ash and grit into sacks to use for the construction of buildings or to fertilise crops. One collector said that middlemen had already told him they would pay up to $56 for a small truck filled with the debris.

Two people were killed when the roofs of their homes collapsed under the weight of the ash and volcanic debris unleashed during the eruption, the disaster agency said.

International airports in Yogyakarta, Solo and Surabaya were closed due to reduced visibility and the dangers posed to aircraft engines by ash, Transport Ministry spokesman Bambang Ervan said. Virgin Australia said it had canceled all its Friday flights to Bali, Phuket, Christmas Island and Cocos Island because of the eruption.

The disaster agency said tremors were still wracking the volcano, but that scientists didn't expect another major eruption. It said all villages within 10 kilometers (6 miles) of Kelud — more than 100,000 people — had been evacuated to temporary shelters, but that elsewhere villagers had returned to their homes to begin cleaning up.

The 1,731-meter-high (5,680-foot-high) Mount Kelud in eastern Java — Indonesia's most densely populated island and home to more than half of the country's 240 million people — has been rumbling for several weeks and was under close observation.

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Muhammad Hendrasto, head of Indonesia's volcano monitoring agency, said the mountain erupted violently about 90 minutes after authorities raised its alert status to the highest level. The disaster agency said it had spewed millions of cubic meters of debris into the atmosphere.

Kelud is among about 130 active volcanoes in Indonesia. The archipelagic nation is prone to volcanic eruptions and earthquakes because of its location on the so-called "Ring of Fire" — a series of fault lines stretching from the Western Hemisphere through Japan and Southeast Asia.

Due to the fertile volcanic soil and the shortage of space on Java, hundreds of thousands of people live close to active volcanoes. They are used to the rumblings, but their proximity to the peaks presents difficulties for authorities.

The last major eruption at Kelud was in 1990, when it kicked out searing fumes and lava that killed more than 30 people and injured hundreds. In 1919, a powerful explosion that reportedly could be heard hundreds of kilometers away killed at least 5,160 people.

Earlier this month, Mount Sinabung in North Sumatra province erupted as authorities were allowing thousands of villagers who had been evacuated to return to its slopes, killing 16 people. Sinabung has been erupting for four months, forcing the evacuation of more than 30,000 people.

AP