Thousands of Aam Aadmi Party supporters were joined by flag waving CPM cadres at the heart of Delhi today as protesters gathered to march to the Prime Minister's Office. CPM leader Sitaram Yechury is lending support to Chief Minister Arvind Kejriwal. But stage has been set for a confrontation, with the Delhi Police claiming that the party has not sought permission for a march. Mr Kejriwal, who has been camping out at Lieutenant Governor Anil Baijal's house for a week, in protest against what he calls a "strike" by Delhi's IAS officers, has repeatedly appealed to the Prime Minister to intervene.