An Oregon county commission has ordered an incinerator to stop accepting boxed medical waste to generate electricity after learning the waste it has been burning may include tissue from aborted fetuses from British Columbia.

Sam Brentano, chairman of the Marion County board of commissioners, said late Wednesday the board is taking immediate action to prohibit human tissue from future deliveries at the plant that has been turning waste into energy since 1987.

"We provide an important service to the people of this state and it would be a travesty if this program is jeopardized due to this finding," he said in a statement.

"We thought our ordinance excluded this type of material at the waste-to-energy facility. We will take immediate action to ensure a process is developed to prohibit human tissue from future deliveries."

The two commissioners on the board told CBC News they have called an emergency meeting for 9 a.m. PT Thursday to deal with the issue and they might rewrite an ordinance to clarify what type of material can be accepted.

Both said their Christian beliefs would not allow them to support the continued incineration of fetal tissue at the plant.

Officials confirm fetal tissue shipped

Kristy Anderson, a British Columbia Health Ministry spokeswoman, told The Associated Press that regional health authorities there have a contract with a company that sends biomedical waste, such as fetal tissue, cancerous tissue and amputated limbs, to Oregon, where it's incinerated in the waste-energy plant.

B.C. health officials told CBC News that before 20 weeks, a woman can choose if fetal remains are treated as biomedical waste, or if they want them to go through a funeral home to bury or cremate the remains.

After 20 weeks, the remains have to be buried or cremated through a funeral home, as per B.C. law. There's no difference in how fetal remains are treated, whether as a result of a miscarriage or an abortion.

The B.C. Catholic, a Vancouver-based newspaper, identified the plant as Covanta Marion, based in Brooks, Ore.  When contacted by The AP on Wednesday, a Covanta Marion representative said he did not know if fetal tissue was included in shipments from Canada or elsewhere.

The facility is owned and operated by Covanta in a partnership with Marion County. According to its website, it processes 550 tons per day of municipal solid waste, generating up to 13 megawatts of energy sold to Portland General Electric.

Medical waste shipments suspended

Marion County estimates that the facility processes about 700 tons of in-county medical waste each year and about 1,200 tons from elsewhere, making it a small percentage of the total waste burned. Out-of-town medical waste is charged a higher fee.

County spokeswoman Jolene Kelley said medical waste has been included in the program for some time, but the commissioners never had any indication that fetal tissue might be included.

"We learned that today," she said.

Commissioners did not say why they believe medical waste shipped to the plant should be free of fetal tissue.

Since they have no idea what's been arriving in the sealed shipments, the commissioners decided to temporarily suspend all medical waste, Kelley said.

Covanta Marion is believed to be the only plant generating energy from waste in Oregon.

The Environmental Protection Agency says medical waste from hospitals is generally excluded from the municipal solid waste used to generate electricity.

Google Maps: Covanta Marion, Marion County, OR

With files from CBC News