Mysterious White Flags Fly Atop The Brooklyn Bridge (PHOTOS)

Police were investigating Tuesday morning why two white flags had mysteriously replaced the American flags that typically sit atop the Brooklyn Bridge.

Police said it wasn’t clear when or by whom the flags were placed on the bridge, according to TV station WCBS. DNAinfo, a website covering New York City, reported that the NYPD’s counterterrorism division was among those reviewing surveillance footage from the bridge.

Both flags were taken down by roughly 11:30 a.m. ET, according to Gothamist.

This post has been updated.