The alleged suicide of a senior police officer in Kolkata has become fodder for attack by the BJP on West Bengal Chief Minister Mamata Banerjee. The party's Mukul Roy has demanded Ms Banerjee's arrest for abetment to suicide and has demanded a CBI probe into the case. "This is for the first time in the history of West Bengal that a senior IPS officer committed suicide and blamed the government or a party leader," Mr Roy said.