New Delhi (CNN) A nun and another employee at a Mother Theresa charity home in the Indian state of Jharkhand have been arrested for alleged child trafficking.

An investigation by the Indian Child Welfare Committee (CWC) revealed that at least two people at the Nirmal Hriday (Pure Hearts) home in the state capital of Ranchi were involved in taking babies from unmarried mothers and selling them.

The investigation was launched after a couple approached the CWC saying they had paid $1,700 to one of the home's employees for a baby boy. They complained she had taken back the baby and kept their money.

"We investigated and it seems that four children were sold off," said Shyamanand Mandal, a police inspector in Kotwali district. "Local people are also involved in this."

The home, run by Missionaries of Charity, the religious order founded by Mother Teresa, gives shelter to unmarried pregnant women.

Mother Teresa stands with nuns of the Missionaries of Charity For Destitute Children in New Delhi in this file photo taken in 1997

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