A 78-year-old man was left needing hospital treatment after a disturbance outside a house in a Highland village.
Officers were called to the Logan Way area of Muir of Ord at about 9pm on Monday.
The pensioner had suffered minor facial injuries and was taken to Raigmore Hospital.
Police Scotland Inspector David Ogilvie said: “Our enquiries are ongoing and we are urging anyone who saw anything unusual or suspicious in the Logan Way area around that time to get in touch.
“In particular we are looking to speak to four teenage boys who are believed to have been in the area at the time.”