A federal Drug Enforcement Agency affidavit obtained by The Associated Press says a Mexican cartel is suspected of laundering $2 million in drug proceeds through a small southwest Kansas bank to avoid tighter restrictions on U.S. currency in its home country.

A search warrant filed Tuesday in federal court lays out the investigation into alleged money laundering between 2011 and 2014 by a cartel known as the Mexican Mennonites and others. The warrant was executed against a former banking official.

Plains State Bank senior vice president Lindsey Schartz says two ex-employees named in a Drug Enforcement Administration affidavit no longer work there.

The case was sealed Wednesday after the AP contacted prosecutors.

U.S. Attorney Barry Grissom says it is an ongoing investigation. No charges have been filed.