Forty people have been found alive in a room in the ruins of a building in the capital of Bangladesh, Dhaka.
At least 220 people are known to have died when the factory building collapsed on Wednesday. Rescue efforts have been going on since then.
Police said the factory owners had ignored warnings not to allow their workers into the building after cracks were noticed on Tuesday.
The factory's owners are now said to have gone into hiding.
The exact number of people still trapped isn't clear, but according to survivors and eyewitnesses, there could be hundreds still missing.
Tens of thousands of family members of those who worked in the building have gathered at the site, waiting for news and helping with the rescue work.
Bangladesh's Prime Minister Sheikh Hasina has announced a national day of mourning on Thursday in memory of the victims.
The disaster has led to questions about the country's buildings, many of which have poor safety standards.
Bangladesh has one of the largest clothes-making industries in the world, with many factories making cheap clothes for big shops across the world.
Clothing retailer Primark has confirmed that one of its suppliers was based in the building that collapsed in Dhaka.
The company said it was "shocked and deeply saddened by the appalling incident" and that it would work with other retailers to look at safety standards.