Not sure what this means but someone has replaced two American flags on the Brooklyn Bridge with mysterious white flags. The white flags flew Tuesday from poles on the stone supports that hold cables above the bridge connecting Brooklyn and Manhattan.

Police say it isn't clear what time they were placed there — or by whom. Several officers scaled the bridge and were seen lowering the flag on the Manhattan side around 11 a.m. as traffic inched along the bridge.

The bridge is one of the most heavily secured landmarks in the city, constantly monitored by surveillance cameras so we should find out who's responsible soon.