A six-year-old boy was sodomised by three persons who worked in a yoga ashram in New Delhi, police said, adding one accused has been arrested.

Police said the incident came to light on Saturday evening when a local person, who visited the ashram, found the boy crying.

"When he asked the boy why he was crying, the victim told him that he was sodomised by three persons identified as Mangal, Chandan and Amarjeet, who worked in the ashram at I.P. Estate," said a senior police officer.

The local person informed the Swami (in charge) of the ashram who had adopted the child three years ago from an orphanage.

The accused offered a chocolate to the boy and took him to a room in the absence of Swami. They also threatened the victim to kill him and the Swami if he disclosed the crime to anyone, the officer said.  

The medical examination confirmed the sexual assault.

"Amarjeet was arrested on Monday evening, while two of his associates, Chandan and Mangal, are still on the run," the officer said.