HOUSTON — Three Texas residents have been arrested in a Toledo, Ohio, drug operation after they tried to mail a kilogram (2.2 pounds) of heat-sealed fentanyl that authorities said was enough to kill the population of Toledo “several times over.”

The Houston Chronicle reports that Anthony Robinson, 32, Barbera Wilson, 21 and Darrius Lewis, 29, were arrested Wednesday and have been charged with federal possession with the intent to distribute a controlled substance. Police say the three were found with an additional half kilogram of fentanyl and more than $8,000 in cash.

An affidavit says the three were attempting to mail the drugs to Houston.

Phone calls to attorneys for Robinson and Lewis were not returned Sunday. An attorney for Wilson said he was evaluating the charges but could not comment further.

Information from: Houston Chronicle, http://www.houstonchronicle.com