Emergency services have resumed a search mission after reports that a microlight aircraft was seen falling towards a wooded area.
Two members of the public raised the alarm on Sunday when they said they spotted the aircraft descending near Cambusbarron, Stirling, at around 4pm.
Fire, ambulance, police and mountain rescue teams were sent to search the wooded area, just south of the village.
The Police Scotland helicopter carried out an aerial search and ground searches were also undertaken.
As daylight ended the search was stood down overnight but resumed on Monday morning.
Inspector Morris Lindsay, of Police Scotland, said: “I would appeal to anyone who may have any information which might assist in this matter to call Police Scotland on the 101 number as a matter of urgency.”
The witnesses had been travelling on the M80 when they saw what they believed to be an aircraft descending into the wooded area.