File - This Jan. 10, 2019, file photo, shows Davis Police as they closed the area near 5th and C streets after a police officer was shot in Davis, Calif. The University of California, Davis says an emergency alert system intended to deliver emails and text messages to 70,000 students and staff failed on the night a police officer was shot and killed near campus last week. The Sacramento Bee reports Wednesday, Jan. 16, 2019, that a pair of alerts went out on Jan. 10 after Davis police officer Natalie Corona was shot, but only 20,000 people received them. (Jose Luis Villegas/The Sacramento Bee via AP, File)
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