Robbers take off-duty Atlanta police sergeant's backpack in Edgewood, officials say

Three suspects robbed an off-duty Atlanta Police Department sergeant on Tuesday on Edgewood Avenue, officials said. 

The officer was walking to his car at 1 p.m., according to Atlanta police officials, when three suspects ran up. 

One grabbed the sergeant's backpack and ran off. 

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Two more people threatened bystanders with guns before running. 

Police said no one was injured, and the investigation is active. 

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