Vandals who have dug holes in the search for valuable bottles are being hunted by police.
Officers are appealing for witnesses after damage was caused by people searching for discarded bottles on land in East Boldon.
The damage was caused between 8pm Monday, and 7am yesteday, at Tile Shed Farm.
The offenders have dug holes on private land looking for bottles.
The process - known as bottling - has led to large holes being left on the land.
Horses graze on the land and there is concern they - and their rider - could be seriously hurt if they go near the holes which are around one metre deep.
Neighbourhood Inspector John Smith said: "There are two concerns here.
"Not only are those responsible trespassing and damaging private land but they're also putting the horses - and if they're being ridden, the rider - at a significant amount of risk.
"Inquiries into this incident are on-going and I'd ask anyone who has information to please get in contact with us so that we can take the necessary action to help prevent it from happening in the future."
Any witnesses should ring Northumbria Police on 101 ext 69191 quoting reference 305 271015 or Crimestoppers anonymously on 0800 555 111.