Jaipur, Feb 17 (IANS) A Rajasthan Police team Friday arrested a 66-year old man and his wife, who are accused of a multi-million rupee fraud, from the Indra Gandhi International Airport in New Delhi, an official said.

The couple was hiding in Hanoi in Vietnam and fled to India when their son was detained by the Interpol there recently, police said.

According to the police, the accused, identified as Than Singh and his wife Prakash Lata, 62, are residents of Mansarovar area in Jaipur.

Their son Manvendra Singh along with four others -- Pramod Sharma, Mahendra Kumar, Asha and Neetu -- had been detained by Interpol and Hanoi police Tuesday, on charges of swindling Rs.2,000 million from thousands of people in Rajasthan and many other states on the pretext of investing in their multi-level marketing firm, named Gold Sukh.

"Than Singh, who is a retired teacher, and his wife were also involved in the fraud as initial investors in the firm. They disappeared before the firm was busted by police in November last year," said a senior police officer.

He added that the duo first fled to Bangkok and then to Hanoi where they were hiding.

"When their son and other directors of Gold Sukh were detained by the Interpol there, they fled to India. But as soon as they landed in Delhi, a Jaipur police team took them into custody," said the officer.

Police said that they got a tip-off from immigration officials about the couple while they booked flights to India.

A Rajasthan Police team is being rushed to Hanoi to arrest the five accused who are detained in Hanoi.

The official added that theaccused duped people by promising unrealistic returns on their investment.