Police blow up backpack, even after determining that it was not a danger

DENVER -- Police detonated a suspicious backpack found in downtown Denver Monday morning.
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Bomb technicians determined the backpack was safe, but detonated the device as a precaution at about 3:45 a.m.

http://www.thedenverchannel.com/news/17285415/detail.html

The backpack was determined to be safe, so I presume it had someone’s stuff in it. Then they blew it up anyway. Why were they not of trying to locate the owner? Maybe the backpack was stolen and the police’s responsibility should be to return the stolen merchandise to its rightful owner. 

This reminds of a King of the Hill episode where the TSA blows up a turkey that Hank is taking to relatives for Thanksgiving.