Bhubaneswar, Feb. 3 :     The Biju Janata Dal is headed for a crisis with party chief Naveen Patnaik expelling his main rival, Bijoy Mohapatra, for anti-party activities less than two weeks before the Assembly elections. Patnaik replaced Mohapatra, who had challenged his leadership, as party candidate from Patkura on the last date of filing nominations today. Mohapatra cannot now contest even as an Independent. Patnaik had earlier suspended Mohapatra on the same charges. But he had to withdraw the order under pressure from Mohapatra aides before the Lok Sabha polls. The BJP chief appeared to have plotted the 'strike' well in advance. He first offered tickets to Mohapatra loyalists Amar Satpathy, Kalpataru Das and Suryanaray Patra, all sitting MLAs. Then he packed them off to their constituencies for campaigning. As a result, Mohapatra today did not have any of his aides around to fight his case. When news broke, angry loyalists rushed to Naveen Niwas, the party chief's residence near Bhubaneswar airport, and raised slogans. Police barricaded the two gates of the house, fearing that the protesters would storm in. But as the evening wore on, the protest fizzled out.