Businessman Robert Vadra, the brother-in-law of Congress chief Rahul Gandhi, was questioned for about 10 hours today in a money laundering case. Yesterday, the Enforcement Directorate quizzed Mr Vadra on allegations that he illegally owns nine properties, cumulatively worth 12 million pounds (Rs. 110 crore), in London. Today, the agency focussed on his links with the main players in the case - controversial arms dealer Sanjay Bhandari, his nephew, and two others, sources said. Mr Vadra has denied the allegations, calling it a political witch-hunt. Coming months ahead of the national elections, his questioning has become another flashpoint between the government and the opposition. Mr Vadra, who left the agency this evening with wife Priyanka Gandhi Vadra, has been asked to appear before the Enforcement Directorate again on Saturday.