FILE - In this March 17, 2019, file photo a police officer stands guard in front of the Masjid Al Noor mosque in Christchurch, New Zealand, where one of two mass shootings occurred. Facebook will work with law enforcement organizations to train its machine learning technology to recognize videos of violent events as part of a broader effort to crack down on extremism. The move comes after its artificial intelligence did not detect the first-person video of a terrorist attack on the mosque in Christchurch. (AP Photo/Vincent Yu, File)
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