Is this the Lough Foyle monster?
A giant fish was spotted on the River Foyle yesterday close to the Peace Bridge.
Derry Now reader Benjamen Lewis captured the large fish on video breaking the surface of the water on Sunday afternoon, but he was unable to identify it.
He says that some people thought it was a dolphin, a shark, or possibly a whale.
If anyone else saw the underwater visitor - or can help identify it - please get in touch.
If you have a story or want to send a photo or video to us please contact the Derry Now editorial team on 028 7129 6600 for Derry City stories Or 028 7774 3970 for County Derry stories. Or you can email [email protected] or [email protected] at any time.