Google's earthquake warning system failed to get to many Turkish residents before February's deadly tremor, a BBC investigation has found.
 
Google said its alert system can give users up to a minute's notice on their phones before an earthquake hits.
 
It said its alert was sent to millions before the first, biggest quake.
 
However, the BBC visited three cities in the earthquake zone, speaking to hundreds of people, and didn't find anyone who had received a warning.

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