Imphal, Feb 14 (Reporter) After bringing troubled Manipur under President’s rule, the authorities on Friday tightened security around the Raj Bhawan and other important locations, while discussions continued within the ruling BJP to find a successor to N Biren Singh, who quit as Chief Minister last week. N Biren submitted his resignation to Governor A K Bhalla on Sunday and the BJP hasn't so far been able to choose a new leader of its legislative party. The Central government on Thursday imposed President's rule in the northeastern state where the legislative Assembly has been kept under suspended animation. Ksh Santa, Manipur state Secretary of the Communist Party of India-Marxist (CPI-M) has demanded fresh election rather than keeping the state under President’s rule. BJP leader Sambit Patra, who is camping in Manipur to hold talks with party MLAs and leaders, has also been given Z category security by the Union Home Minister. A notification issued by Ministry of Home Affairs said President of India Droupadi Murmu received a report from Manipur Governor Bhalla and after considering the report and other information she was satisfied that a situation has arisen in which the Government of the state could be carried on in accordance with the provisions of the Constitution of India. So she imposed President's rule. This is the 11th time that President's Rule has been promulgated in Manipur. The last time such a measure was in place was from June 2, 2001 to March 6, 2002 - a period of 277 days. Manipur had then witnessed a major crisis on the demand for protecting the territorial integrity of the state. Eighteen persons died during the violence in June, 2001...////...