Mysterious Park Slope Bagging

These days, the police get more and more calls about "suspicious packages." And luckily, most of the time, the suspicious packages are just bags left aside. But yesterday, there were a number of suspicious bags found all around Park Slope. The Daily News reports:

About 3 p.m., police started spotting suspicious briefcases, luggage and duffel bags in Park Slope. A grid search of the area turned up bags on Eighth Ave. and Carroll St. as well as spots on Union St., Montgomery Place and Berkeley Place. About nine bags had been found as of last night. "The more we're investigating them, the more we are seeing them," a police source said.

All the bags were harmless and extremely puzzling. Was it "Throw out your empty bags" day? Or was it some conceptual art we'll hear about later?