The BJP is using black money to fund Narendra Modi's rallies and the source of the expenses should be probed, Union Law Minister Kapil Sibal alleged on Wednesday.br br "Earlier, BJP was speaking about black money inside and outside parliament. But there is now no talk of black money anymore. I want to ask Advani and Modi: Where is the black money coming from? Why are you not speaking about it? Why are you not assuring the nation that the black money used by you should be probed?" Sibal said at a press conference in Delhi.