A man has been arrested as part of an investigation into illegal waste dumping.
Environment Agency and Yorkshire & Humber Regional Organised Crime Unit carried out enforcement action this morning, but is yet to say where it happened.
A 46-year-old man was arrested and evidence was seized, the unit said.
An investigation known as Operation Cesium is looking into illegally dumped baled waste at 17 sites.
Michael Brown, lead investigator, part of the Environment Agency’s National Investigation Team said: "We are determined to tackle waste crime and bring those responsible to account; in this case we are thoroughly following and interrogating the evidence so that we have a robust case to take to court.
"This investigation is complex, with waste being illegally dumped across many parts of the country, blighting those communities.
"Illegal waste and the criminals behind waste crimes divert as much as £1 billion every year from legitimate businesses and the treasury, which is why we take tough action against serious offenders. In 2016 our prosecutions resulted in fines totalling £8 million.
"It’s our job to do everything we can investigate these crimes and prosecute those we believe responsible.
"Convictions for waste crime can include large fines and a custodial sentence."
Detective Constable John Davies, of the Yorkshire & Humber Regional Organised Crime Unit, said: "We’re committed to working with our partner agencies to effectively investigate and relentlessly disrupt criminal activity.
"By working together, we can utilise our collective knowledge, experience and powers to bring offenders to justice.
"This investigation has been ongoing since 2016 and we will continue to examine the evidence to determine the full extent of the suspected offences in efforts to being those responsible to account.
"Waste crime is taken extremely seriously. If anyone has information connected to this investigation or suspects other waste crime contact Crimestoppers on 0800 555 111 or the Environment Agency on 0800 80 70 60."