They told police they received 1,000 yuan (143 dollars) to buy the baby for adoption by a Chinese woman, the paper said, adding the child was taken to a social welfare centre.

The arrests came after police here detained six Vietnamese who tried to take two newborn baby boys across the border into China for adoption last Monday.

Vietnamese police busted a trafficking syndicate in February, which sold babies to China for adoption, reportedly charging about 500 dollars each for girls and 1,000 dollars for boys.

The US embassy in Hanoi last month issued a damning report about widespread baby selling and rampant corruption in Vietnam's adoption system, which led authorities here to cancel a bilateral adoption agreement.

Agence France Presse - May 11, 2008