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NEW DELHI: Jeweller Nirav Modi , the main accused in the Rs 13,000 crore PNB fraud , travelled on his Indian passport as recently as June 12, when he took a Eurostar high-speed train from London to Brussels.A source said Modi avoided taking a flight on June 12 from London, choosing to travel by rail instead. Indian officials have verified this from European immigration authorities who captured Modi's passport details on his trip to Brussels.Though Nirav Modi's passport was revoked on February 24, the Central Bureau of Investigation moved the Interpol on June 11 for a red corner notice. The agency did so after a chargesheet was recently filed against Modi.In the past, requests for RCN have sometimes not succeeded in the absence of a chargesheet and officials said Interpol has not been consistent in this regard.With Interpol being approached just recently, Modi could have availed of the window available to him to travel to Brussels. Asked how Modi was still managing to travel on a revoked passport, a foreign ministry spokesperson said, "We will know how he is travelling only when we are informed by (investigating) agencies."According to the official, the onus of informing Interpol about revocation of Modi's passport and imposing travel restrictions is on the investigating agencies. The CBI had approached Interpol to get a 'diffusion notice' against Modi which would have required member countries to inform the agency through Interpol of Modi's presence in their jurisdiction.Modi's passport details need to be incorporated in the international police body's database of lost or cancelled passports which imposes travel restrictions. His passport was revoked on a request from the CBI and the Enforcement Directorate. However, he is understood to have made frequent trips across Schengen countries using his Indian passport. The source said Modi, born in Belgium, had a Singaporean passport and possibly a third one from Morocco, which is being verified.From Malllya to Nirav Modi, the UK remains the preferred hideout of Indian FugitivesThe CBI and the ED registered separate cases of fraud and money laundering against Modi in February, soon after he fled the country with his family members when PNB reported the scam to the agencies. According to intelligence gathered by agencies, Modi recently visited London to explore the possibility of obtaining a long-term UK visa that would give him protection from deportation. According to information, he was trying to obtain an ILR (indefinite leave to remain), similar to what fugitive liquor baron Vijay Mallya has. An ILR makes extradition cumbersome and requires a lengthy court battle.In Brussels, Indian authorities have informed banks and financial institutions about the investigation against Modi, blocking his financial transactions. However, the source said these preventive measures had hardly impacted Modi's business as he was able to carry out operations through companies allegedly floated by his father and associates.The ED, which has attached Modi's assets in India worth Rs 3,000 crore, is planning to file extradition requests with multiple countries as he has been frequently changing locations.