What we know about missing woman Clare Marshall

Police have announced an "extensive" search of the River Tay following the disappearance of 64-year-old Clare Marshall from Perth, Scotland.

Marshall's disapperance comes on the heels of the search for Gaynor Lord, 55, whose body was found in the river River Wensum on 15 December, a week after she was reported missing.

What we know about the disappearance

Police have been searching in the Dundee Road area and in the River Tay, and have mobilised the search helicopter to aid in their efforts to find her.

"We're concerned for Clare's welfare and have been carrying out extensive searches in the area of Dundee Road and the River Tay," said Inspector Kris McCall.

"Specialist resources, including the police helicopter, have been searching for Clare since we were alerted to her disappearance.

"I urge anyone with information about Clare's whereabouts to get in touch with police by calling 101.

"Likewise, I would appeal directly to Clare: if you see this message, please contact the police or approach any officer so we can ensure you're safe and well."

Marshall has shoulder-length grey hair and is around 5ft 4in tall.

What we don't know about the disappearance

Police believe Marshall left her home in the early hours of Monday morning and might have crossed over a bridge to Moncreiffe Island on the River Tay.

They have also released details about the clothes they believe she was wearing, an all-black outfit.

There has been no information released about any last-known sightings of Marshall, nor have any eye-witnesses been publicly identified at this time.

The authorities have also not given any information on the days leading up to her disappearance.