More than 30 officers and police divers are searching for a doctor from Lincolnshire who has been missing for five days.
Dr James Layfield, from Friskney, who works at the Beacon Medical Practice in Skegness, was last seen by a neighbour on Saturday evening.
Police underwater search teams have been searching lakes near his home at Friskney.
Officers are also investigating his movements prior to his disappearance.
A spokeswoman for Lincolnshire Police said members of the public have come forward with potential sightings of the missing GP, whose disappearance has been described as "out of character".