Bangladeshi rescue workers say a large group of people has been found alive inside a clothes factory on the outskirts of the capital, Dhaka.
Rescuers had dug tunnels and found as many as 50 people trapped at various places on the third floor of the building, one report said.
Hundreds of people are still missing, three days after the Rana Plaza building collapsed in Bangladesh's capital city Dhaka.
Local officials say over 300 people died in the disaster.
The building housed clothes factories, and there are reports some 2,000 workers were inside when it collapsed.
Bangladesh's Prime Minister Sheikh Hasina has called for special prayers to be held across the country later for the victims.
The disaster has led to angry protests in Bangladesh against poor building safety standards.
Thousands of Bangladeshis took to the streets of Dhaka to demonstrate, insisting that the factory owners be arrested.
Police say the owner of factories in the building had ignored warnings about cracks appearing earlier this week.
The owner is said to be in hiding, but Sheikh Hasina has promised that he will be punished.