A portion of the 91-metre dump collapsed following a fire incident on Friday as the residents celebrated the traditional Sri Lankan New Year, burying dozens of residential buildings and trapping many people in Meetotamulla area in Kolonnawa.
At least seven children were among the dead. Some still remain untraceable after the mishap, officials said.
The death toll climbed to 31, the Colombo Gazette reported, adding that the military was continuing its search and rescue operation at the site.
The tragedy has displaced nearly 200 families numbering more than 1500. Nearly 80 houses were completely destroyed while many more suffered partial damage, according to Sri Lanka's Disaster Management Centre.
The affected families have blamed politicians for the tragedy, though President Maithripala Sirisena has ordered officials to ensure maximum relief to them.
The National Building Research Organisation said people still living in over 130 houses in the area must be relocated for safety.
The Parliament was recently warned that 23 million tonnes of garbage at Kolonnawa dump was a serious hazard.
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