(Dayton)--More than 20,000 marijuana plants were seized throughout Ohio, this summer.

The U.S. Drug Enforcement Administration reports that more than 20,470 plans were seized by law enforcement this summer.

Multiple County Sheriff's Departments, and agents from the Ohio Attorney General's Bureau of Criminal Investigation, worked to remove the illegal plants.

A federal grant helped fund the use of helicopters and pilots, supplies as well as administrative costs.

Police tell The Dayton Daily News that outdoor seizures have declined as pot growers are using sophisticated grow operations indoors that are not usually detected by helicopters.

In 2010, police seized over 105,000 plants over the summer growing season. 22,000 of those plants were found in a remote area of Pike County.