We can confirm armed officers are in attendance in Thornton following a report a firearm was sighted on Sunday (7 April).
Police were called at around 3.45pm, when a member of the public reported seeing the firearm on land in Hedgecroft.
Patrols attended and the area remains cordoned off while open land searches continue.
Officers would urge anyone who has any information about the storage of firearms in this area to get in contact via @MerPolCC or 101. You can also speak anonymously to Crimestoppers via @CrimestoppersUK on or 0800 555 111.