South Korean customs officials said they are cracking down on an operation that is smuggling in pills from China made from the flesh of dead babies, according to Korean media reports.

Twenty-nine smugglers of "human-flesh capsules" have been arrested after trying to smuggle 11,000 pills into South Korea from China while disguised as tourists, according to The Korea Times.

“Some put herbs together in the capsules so that customs agents cannot distinguish the unique smell and color of the human-flesh capsules," a Korea Customs Service official told the newspaper. "Others put the capsules in medicine containers to deceive inspectors."

The pills, which are taken by people who believe they may help increase stamina, for rejuvenation or by terminal cancer patients, are made of powder made from dried fetuses or dead babies, the customs office told the Korea Times.

More than 35 cases and more than 17,000 pills have been found by customs authorities since August of last year, the South Korean website Dong-A Ilbo reported.

South Korea's crackdown comes after a documentary called "Lee Yeong-don’s Food X File" aired in April 2011, describing the smuggling of the capsules as well as harmful effects of the pills. The documentary claimed that tests done in South Korea and by KCS showed that the content of the pills they received was "99.7 percent identical with humans," China Daily reported.

The documentary team went to China, where they found and shot video of a hospital that sold materials, according to China Daily. Chinese officials said they have strict rules forbidding the sale of placentas or any medical waste.

The Ministry of Health began investigating the issue after the documentary.

"Since human flesh capsules are confirmed to contain ingredients lethal to humans, including super bacteria, we will preemptively curb their smuggling at borders to protect public health," a customs official told Dong-A Ilbo.

The website reported the capsules were being smuggled from northeastern China after requests from buyers in South Korea.

But now, Korean officials said, they will be putting in effect a significant number of measures to try to stem the smuggling of the pills.

Customs officials will be even more diligent in checking belongings of international travelers as well as global mail, Dong-A Ilbo reported. That includes opening packages and "checking all capsules and powder made from unknown substances" and labeled drugs that come from China.