CCTV captures terrifying moment baby falls while nanny sleeps

An undated CCTV video has gone viral after showing a one-year-old girl falling down a staircase while the nanny responsible for her care slept through her cries and repeated alarms. The mother, watching remotely from work, called police when she could not wake the nanny. Police officers arrived at the house and repeatedly knocked on door, finally waking the nanny.