A curious formation attracting attention in the US is actually a spinning ice disc that is roughly 91 metres wide.
The formation in the Presumpscot River in Greater Portland, Maine, has drawn comparisons to an alien spacecraft, a carousel and the moon.
The oddity in Westbrook drew a crowd that stood mesmerised by the slow-turning disc.
Locals said they have seen smaller ice discs before but nothing like this one, Ms Radel said.
Rob Mitchell, who owns a nearby office building, spotted the alien-looking disc and immediately notified the city.
Officials said the disc is spinning slowly counter-clockwise and has served as a big raft for ducks and other birds.
“The ducks were rotating on this big Lazy Susan,” Mr Mitchell said.