People were asked to “leave the danger zone,” the region’s police commissioner, Ulfar Ludviksson, told Iceland’s RUV broadcaster. But he said individuals staying in “seven or eight houses there… have decided to remain in the town.”

There were fears that the town was “in danger of having lava flows entering the inhabited area”, said Rikke Pedersen from the Nordic Volcanological Centre.

A hot water pipe has broken in the northern part of Grindavík, which confirms that considerable cracking has occurred within the town, the Icelandic Meteorological Office (IMO) said.

The protective barriers around Grindavik have also been breached, as new eruptive fissure opened a few hundred meters inside, the IMO reported. But volcanic activity eased off in the early afternoon on Tuesday.

Roads in and out of the town remain closed, but flights are currently not affected.

Most of the 4,000 residents of Grindavík left in a mass evacuation in 2023 because of the dangers of the volcanic activity. The volcano has erupted several times since.

The length of the magma that formed on Tuesday under the crater series stretched to about 11 km (6.8 miles) – the longest that has been measured since 11 November 2023, meteorologists said. The magma corridor extends about 3km further northeast than seen in previous eruptions.

Based on current wind direction, gas pollution from the eruption will travel northeast towards the capital area, the IMO added.

The eruption, which began around 09.45 local time (10:45 BST), occurred after several earthquakes hit the area known as the Sundhnúk crater range.

The Mandalay resident who spoke of bodies being “cremated in stacks” lost her aunt in the quake.

“But her body was only pulled out of the rubble two days later, on 30 March,” said the 23-year-old student who wanted only to be known as J.

Poor infrastructure and a patchwork of civil conflicts are severely hampering the relief effort in Myanmar, where the military has a history of suppressing the scale of national disasters. The death toll is expected to keep rising as rescuers gain access to more collapsed buildings and cut-off districts.

J, who lives in Mandalay’s Mahaaungmyay district, has felt “dizzy from being deprived of sleep”, she said.

Many residents have been living out of tents – or nothing – along the streets, fearing that what’s left of their homes will not hold up against the aftershocks.

“I have seen many people, myself included, crouching over and crying out loud on the streets,” J said.

But survivors are still being found in the city. The fire service said it had rescued 403 people in Mandalay in the past four days, and recovered 259 bodies. The true number of casualties is thought to be much higher than the official version.

In a televised speech on Tuesday, military chief Min Aung Hlaing said the death toll may exceed 3,000, but the US Geological Survey said on Friday “a death toll over 10,000 is a strong possibility” based on the location and size of the quake.

Young children have been especially traumatised in the disaster.

A local pastor told the BBC his eight-year-old son had burst into tears all of a sudden several times in the last few days, after witnessing parts of his neighbourhood buried under rubble in an instant.  “He was in the bedroom upstairs when the earthquake struck, and my wife was attending to his younger sister, so some debris had fallen onto him,” says Ruate, who only gave his first name.  “Yesterday we saw bodies being brought out of collapsed buildings in our neighbourhood,” said Ruate, who lives in the Pyigyitagon area.

“It’s very sobering. Myanmar has been hit by so many disasters, some natural, some human made. Everyone’s just gotten so tired. We are feeling hopeless and helpless.”

A monk who lives near the Sky Villa condominium, one of the worst-hit buildings reduced from 12 to six storeys by the earthquake, told the BBC that while some people had been pulled out alive, “only dead bodies have been recovered” in the past 24 hours.  “I hope this will be over soon. There are many bodies still inside, I think more than a hundred,” he said.

Crematoriums close to Mandalay have been overwhelmed, while authorities have been running out of body bags, among other supplies, including food and drinking water.

Around the city, the remains of crushed pagodas and golden spires line the streets. While Mandalay used to be a major centre for the production of gold leaf and a popular tourist destination, poverty in the city has soared in recent years, as with elsewhere in Myanmar (formerly called Burma).

Last week’s earthquake also affected Thailand and China, but itsnimpact has been especially devastating in Myanmar, which has been ravaged by a bloody civil war, a crippled economy and widespread disillusionment since the military took power in a coup in 2021.

On Tuesday, Myanmar held a minute of silence to remember victims, part of a week of national mourning. The junta called for flags to fly at half mast, media broadcasts to be halted and asked people to pay their respects.

Even before the quake, more than 3.5 million people had been displaced within the country.

Thousands more, nany of them young people, have fled abroad to avoid forced conscription – this means there are fewer people to help with relief work, and the subsequent rebuilding of the country.

Russia and China, which have helped prop up Myanmar’s military regime, are among countries that have sent aid and specialist support.

But relief has been slow, J said.

“The rescue teams have been working non-stop for four days and I think they are a little tired. They need some rest as well.

“But because the damage has been so extensive, we have limited resources here, it is simply hard for the relief workers to manage such massive destruction efficiently,” she said.