Rescuers in China managed to pull two people out of the rubble of a collapsed building in Changsha city, Hunan province, two days into a search-and-rescue operation for dozens of people who are unaccounted for and feared dead.

The rescue of the two people on Sunday evening took place after emergency responders “detected signs of life” in the afternoon, more than 50 hours after rescue operations were launched.

“When she was discovered, she was in relatively good condition. Her vital signs were quite stable and she could hold a normal conversation with rescuers outside,” a CCTV reporter on the scene was quoted as saying by AFP on the condition of one of those rescued on Sunday.

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Earlier on Saturday, rescuers managed to pull five people out of the rubble of the large building, which housed a hotel, apartments, as well as a movie theatre.

As it stands, a total of seven people have been rescued, while at least 16 people are still believed to be trapped underneath the rubble, and around 40 are unaccounted for and presumably dead.

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The collapse itself took place on Friday, following which more than 700 first responders were dispatched to the scene to look for survivors.

The incident caught the attention of Chinese President Xi Jinping, who vowed to rescue those trapped “at all cost[s]” and ordered a thorough investigation into the collapse.

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While no official reasons for the collapse have been provided as of now, Chinese authorities have detained nine people, including the building’s owner and a team of safety inspectors, in connection with the incident and an investigation is underway into what authorities alleged was the result of the falsification of a safety audit of the building.

That being said, building collapses are not uncommon in China, where safety standards are relatively lax and there is widespread corruption among officials tasked with reviewing and enforcing safety standards.

A few months back, in January, another collapse took place in the city of Chongqing, where an explosion triggered by a suspected gas leak destroyed a building, leaving 16 people dead.