The CBI on Tuesday raided Delhi Chief Minister Arvind Kejriwal’s office here, Kejriwal tweeted.Kejriwal said his office has been raided by the Central Bureau of Investigation (CBI). “CBI raided my office,” Kejriwal tweeted.Kejriwal said in another tweet: “When Modi could not handle me politically, he resorts to this cowardice.” Delhi chief minister's office is located at the Delhi Secretariat.The reason for the CBI was not immediately known.