NASHVILLE EXPLOSION: Witnesses Report Hearing Gunfire and a Warning Prior to Detonation, POLICE ON SCENE DID NOT EVACUATE THE BUILDING DESPITE THE BROADCAST WARNING

Listen to what this woman says. She says she heard the broadcast warning saying, "There's a bomb in this RV. You have 30 minutes to evacuate." 

And then when it got to 15 minutes, the warning starting repeating every minute. "You have 15 minutes... You have 14 minutes ... You have 13 minutes." 

Meanwhile, the woman says Police were on the scene, and she was in the building across the street.

If this woman's description of events is accurate, this means the Police were given fair warning, and plenty of time to react, yet they didn't do a thing to protect the citizens.