noises. first just banging and then more intense noise. >> suddenly, around 1:10, i hear a smash, the wall is collapsing. the wall above me. i said they are really doing major construction. it was a big boom. i was running to see where the sound come from and i saw all the garage collapse. >> reporter: at the towers east complex, a few feet away from the collapse site, fearful residents are being told of urgent efforts to sure up their building. according to building official and a letter to residents from the building's condo association obtained by cnn, specific repairs beginning there week, including suring up a pillar where concrete spaul sprawling or crumbling was observed. sensors will be installed throughout the cop mplex to dett

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