Story highlights As many as 164 apartments were in the building

National construction agency had previously condemned the building, authorities say

(CNN) Hours after a residential building collapsed in a heap of rubble in Kenya's capital, a man emerged holding up a baby wrapped in a pink blanket as the crowd erupted into cheers.

Another man followed him, carrying a toddler also pulled from the debris. Both children were rushed to waiting ambulances.

As the hours passed following Friday's collapse of the seven-story building in Nairobi, rescuers heard sounds of hope as voices of trapped survivors called out, terrified but alive. Workers yanked chunks of concrete from where the building once stood, the cries spurring their efforts.

Rescuers worked through the night to find survivors.

At least 12 people were killed and an additional 134 others suffered injuries, the Kenyan Red Cross said.

Others feared trapped

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