Delhi Police has got information on 12 people who travelled abroad on diplomatic passports issued to MPs and their families, a senior official said on Wednesday.
Casting new light on the emigration racket, a senior official said that six of the 12 had travelled with Babubhai Katara, the Bharatiya Janata Party (BJP) MP whose arrest last week unravelled the scam.
This information was provided to the police after they contacted the US embassy and the high commissions of Britain and Canada here through the ministry of external affairs (MEA).
"We have been able to retrieve information about 12 people who might have travelled to the United States and Britain in the past three years," the official said.
"According to initial investigations, six of the 12 had travelled with Babubhai Katara," he added.
Katara, who represents Dahod in Gujarat, was held on last Wednesday from the international airport in Delhi while trying to take a woman called Paramjit Kaur and a teenage boy Amarjeet to Toronto on his family's passports.
Police suspect that apart from Katara, the four MPs named by his associates who were arrested on Saturday, could also have taken people abroad by using their diplomatic passports.
Police have sent notices to Bahujan Samaj Party (BSP) MPs from Uttar Pradesh - Mohammed Tahir Khan (Sultanpur), Mitrasen Yadav (Faizabad) and Ashok Rawat (Misrikh) - and BJP's Ramswaroop Koli who represents Bayana in Rajasthan.
Police have made six arrests in the matter and crime branch teams are conducting raids in different parts of the country.