The Aam Aadmi Party on Monday alleged that graffiti threatening Chief Minister Arvind Kejriwal were scribbled inside the metro trains in Delhi, as it accused the BJP of being behind this incident. A senior police officer said they have taken cognisance of the matter and probing into it. Addressing a press conference, AAP leader Atishi said the BJP is rattled by the fact that it is going to lose all seven seats in Delhi, that is why it has been targeting Kejriwal by "hatching different conspiracies." "They got him arrested on March 21 and then when he was lodged inside Tihar jail, they stopped his insulin for 15 days and we had to approach the court. After he came out, they used Swati Maliwal to target him but that conspiracy also did not pay off since the videos revealed that the assault allegations were false." she alleged. "Now there is a danger to his life," she added. Atishi claimed that a man had scribbled graffiti on the walls of three metro stations -- Rajiv Chowk, Patel Ch