Volunteers sleep before they begin more rescue operations on Sunday, April 28, at a building that collapsed in Savar, Bangladesh, outside the capital, Dhaka. Authorities are still working to remove injured people and bodies from the ruins of the building, which housed garment factories and shops. The death toll stands at more than 370 after the building collapsed Wednesday, April 24.
Building collapses in Bangladesh
The death toll has climbed to 378
Police: The building's owner was trying to flee the country
An outstretched hand from the rubble holds a note
A man pleads to be rescued for days but then dies
(CNN) -- Seventy-two hours.
In any calamity, the first 72 hours are critical. The chances of finding survivors dwindle significantly after that.
But in the Dhaka suburbof Savar, Sunday marks day four of a catastrophic building collapse. And miraculously, from the rubble of mangled metal and cement,the livingcontinue to emerge.
Authorities rescued four people from the crumbled nine-story building Sunday morning -- and rumors flew that more have been spotted in a small pocket in the sandwiched structure.
Anger over building collapse
Survivors found in collapsed building
If true, the new survivors will add to the growing total of people pulled out alive, which already stands at more than 2,400.
Buoyed by hope, authorities have decided to delay moving from a rescue operation to a recovery one.
The heavy machinery they brought in to tear through the large slabs of concrete sit idle for the moment as rescuers -- a combination of troops and volunteers -- claw through the dirt and debris with bare hands or with rusty saws.
"It's been made clear by the authorities that the highest priority would be to find survivors," said Morshed Ali Khan, a reporter with the Daily Star newspaper. "Machinery is the last option."
The death toll now stands at 378, according to Dhaka district police official Kumar Mukherjee.No one knows for sure how many remain unaccounted for. More than 600 by some counts.
Authorities have arrested six people: three factory owners, two government engineers, and the owner of the building, Sohel Rana -- a local-level leader of the ruling Awamil League party. He had gone into hiding soon after the collapse, and police said he was trying to flee the country.
A deadly lure
The commercial building housed five garment factories, several shops and a bank.
The collapse occurred Wednesday morning, a day after cracks appeared in the structure. It led the bank to order its employees not to report for work, and the shops were closed because of a strike.
But garment workers were told to come in despite their concerns that the building's structure was not sound.
Savar, about 45 kilometers (27 miles) from the capital Dhaka, is home to many of the country's more than 4,000 garment factories.
Bangladesh is among the top exporters of clothes to the United States and Europe; the industry accounts for 77% of its exports.
And while deadly accidents and deplorable conditions at garment factories are all too common, the pay is still a lure for many in this impoverished country where the minimum wage is a mere $38 a month.
The last major building collapse in Bangladesh occurred in 2005, in the same area as Wednesday's, and killed more than 70.