Lincolnshire Police are asking residents if they have seen a man in a small blue car acting suspiciously in uphill Lincoln.
The incident happened between 12.20pm and 1.30pm on Wednesday, August 13, in the Newport area of Lincoln.
A man aged between 30 and 40, in a small blue car, reportedly stopped a very elderly man in the street and made indecent comments towards him.
The car is also thought to have been seen parked on St John’s Road, close to the cemetery gates.
Officers would like to trace the man in the vehicle to carry out enquiries.
Anyone who saw the vehicle or man in the area around the time should contact Lincolnshire Police on 101, quoting incident 217 of August 13. Alternatively contact Crimestoppers anonymously on 0800 555 111.