Strange lights caught over Savannah, Georgia

On March 9, 2016, a witness was walking in the streets in Savannah (Georgia, USA). Once night has fallen, he has photographed some strange lights flying in the sky.

Witness statement:

I was walking on river street in Savannah Georgia, taking a lot of night photos using my LUMIX DSLR camera. When I came back to my girlfriends dorm to look at my photos from the day, we noticed the strange lights about the bridge. I have no idea what it can be.