New Delhi, March 16 : After the Central Bureau of Investigation (CBI) on Thursday registered an FIR against former Delhi Deputy Chief Minister Manish Sisodia in 'Feedback Unit (FBU)' case, Chief Minister Arvind Kejriwal said that it was said for the country. Reacting to the development, Kejriwal alleged that this was the PM's plan to keep Sisodia in jail for a prolonged period of time. "PM's plan is to slap several false cases against Manish and keep him in custody for a long period. Sad for the country!" the Delhi CM tweeted. The FIR reads that they got a complaint in this respect from the L-G office. After this a preliminary enquiry (PE) was registered. The CBI had alleged that FBU was created and allegedly used for collecting intelligence related to "political activities of persons, political entities and political issues touching the political interest of AAP". /IANS