Police believe a missing 77-year-old Harrogate man caught the bus to Leeds on the day he disappeared.
George Bass was reported missing by his wife on Wednesday morning.
North Yorkshire Police have released a CCTV image of Mr Bass at Harrogate bus station on the same day.
They believe he boarded a bus bound for Leeds at around noon.
As well as searching the Harrogate area, officers are also focusing their enquiries in the Leeds area and with the bus network.
Anyone with information should call the force on 101.