Continuing his attack on Prime Minister Narendra Modi over banking frauds, Congress president Rahul Gandhi on Monday said that "saheb's" (an allusion to Prime Minister Modi) silence over the scams betrays which side his loyalty lies.The Congress president took to verse to ask where is the "chowkidaar" (watchman) who used to say that he would neither indulge in corruption himself nor let others do, in the backdrop of the latest Rs 11,300-crore Punjab National Bank (PNB) scam that has diamantaire Nirav Modi at its centre."Pehle Lalit, phir Mallya, ab Nirav bhi hua faraar/Kahan hai 'na khaoonga, na khane dunga' kehne wala desh ka chowkidaar? [First Lalit (Modi), then (Vijay) Mallya and now Nirav (Modi) too has fled/Where is the watchman who used to claim he would neither indulge in corruption himself nor let others do]," Gandhi tweeted."Saheb ki khamoshi ka raaz jaanne ko janata beqrar/unki chuppi cheekh cheekh kar bataye, wo kiske hain wafadaar (The public is eager to know the secret of saheb's silence as his silence suggests where his loyalty lies)," he added.On Sunday too, Gandhi had attacked the Prime Minister over his silence on the banking fraud involving Nirav Modi and urged the government to "speak up"."Stop behaving as if you are guilty! Speak up," Gandhi had said.Nirav Modi fled the country just before the scam came to light. The ruling BJP and the Congress have been trading charges over who detected and acted against the banking fraud that dates back to 2011-12.