The controversy over an alleged assault on the chief secretary of the Delhi government has taken a new turn with the resignation of the chief minister's advisor, V K Jain, who was present at Arvind Kejriwal's residence when the incident is believed to have taken place. Jain has resigned citing "personal reasons", a source said. According to a submission by the Delhi Police in a court, Jain had disclosed that Aam Aadmi Party MLAs Prakash Jarwal and Amanatullah Khan had surrounded and assaulted chief secretary Anshu Prakash at Chief Minister Kejriwal's residence late at night on February 19.