Up to 14 sheep were killed and a 60 year-old man sustained minor head injuries in a collision on the Poortown Road.
It involved a farm vehicle, transporting sheep, and an Isle of Man Water Authority vehicle, both travelling in opposite directions.
A number of other sheep were seriously injured in the incident which occurred around 2pm on Monday.
Police are anxious to hear from anybody who may have witnessed the collision.
The contact details: PC Walsh or PC Jones on 631551 or the anonymous Crimestoppers number - 0800 555 111.