Source for news of a 12th floor electrical room "explosion"?
From my Arco Plaza tower vantage point, there doesn't appear to be much eagerness in the pace of the officers - lots are now standing around and milling around with no sense of urgency. However, streets remain blocked and no police, bomb squad, or fire vehicles have left.
They have taken a lot of fire hoses off the trucks and carried them towards the east die of the building.
Just to be clear, I'm talking about yesterday's event at One Wilshire. My source was an individual who does fiber-optic work (running cables, etc) in that building and others in downtown LA.