A man was found with serious head injuries in a Clackmannanshire street.
The 47-year-old was discovered in Park Street, Tillicoultry, at around 12.20am on Sunday.
He was taken to Forth Valley Royal Hospital, where he remains in a serious condition.
Officer inquiries are ongoing to establish how the man became injured.
Detective sergeant Yvonne Leishman said: “At this time, we are appealing for anyone in Park Street or the surrounding area between midnight and 12.30am who saw anything suspicious, to please contact police immediately.
“We are particularly interested in speaking to the occupants of a dark-coloured car and a smaller light-coloured car seen driving along Park Street towards Hareburn Road, just prior the arrival of emergency services.
“If you were one of these individuals, please get in touch.”