Delhi Water Minister Kapil Mishra said on Tuesday that the ACB had summoned him on July 4 regarding a "water tanker scam" he had exposed and he feared he might be arrested."I have come to know from reliable sources that the ACB is planning to arrest me at the earliest," Mishra told journalists. "They want to arrest me as early as possible."He said the Anti Corruption Branch (ACB), which the central government controls, had summoned him for questioning regarding the scam which took place during the previous Congress regime in Delhi.Congress leader Sheila Dikshit headed the Delhi government for 15 years till December 2013."Why is the BJP after us and not Sheila Dikshit?" Mishra asked, adding he was not afraid of going to prison.