Four people have been arrested over suspected illegal waste activities in mid-Wales.
Officers from Natural Resources Wales (NRW) executed search warrants at a number of premises around Aberaeron, Ceredigion.
Those taken into custody were three men, aged 74, 57 and 40, and a 65-year-old woman. NRW says they are being questioned ahead of any enforcement action.
The operation was supported by Dyfed Powys Police, Mid and West Wales Fire and Rescue Service, the Health and Safety Executive and Ceredigion County Council.
Lyn Richards, NRW crime team leader, said: “Those acting illegally can undercut and undermine legitimate businesses, so if we are concerned that someone is not playing by the rules, we will investigate and take action.
“Waste operators have strict rules which they have to abide by for a reason – to make sure that businesses are on a level playing field, and that people and the environment are protected.”