Cause of Brooklyn Bridge Closing Information 5/27/2013

A suspicious abandoned car seems to be the cause.

The vehicle was found in the right lane of the Manhattan bound side of the bridge, mid-span.
Traffic was diverted, as video from CNN affiliate WABC showed police vehicles blocking access.
Video also showed someone in a protective body suit combing through the vehicle. Afterward, an officer wearing no protective gear walked right up to it with a dog.
The car has no plates, nor does it have a vehicle identification number, according to Christopher Miller, a spokesman with the New York City Office of Emergency Management.

From CNN.