New Delhi, March 11 (IANS): A special court here on Wednesday summoned former prime minister Manmohan Singh, industrialist Kumar Mangalam Birla and former coal secretary P.C. Parakh and others in a coal block allocation case. Here is the timeline of the case:

October 2013: CBI registers FIR against K.M. Birla, P.C. Parakh and others on charges of criminal conspiracy and corruption in the allocation of coal blocks.

August 28, 2014: CBI files closure report in the case, saying evidence collected during probe did not substantiate the allegations levelled against the people named in the FIR.

October 21: CBI files revised closure report in the case.

December 16: Court rejects closure report, orders further probe and to record statements of the former prime minister who was then holding coal ministry portfolio.

January 2015: Manmohan Singh was questioned by CBI in connection with the case.

January 27: CBI files progress report of investigation.

February 19: CBI files final report in the case.

March 11: Court summons Manmohan Singh, Birla, Parakh, Hindalco company, its officials Shubendu Amitabh and D. Bhatt acharya in the case for April 8.