Here is a timeline of the Malegaon blast probe:
September 29, 2008: Seven people are killed and 101 injured after a bomb planted on a motorcycle goes off at Malegaon in Maharashtra's Nashik district.
October 2008: Police arrest Sadhvi Pragya and 3 others.
November, 2008: Anti-Terror Squad arrest Colonel Purohit, a serving army officer.
January 2009: Anti Terror Squad files final chargesheet against 11 accused. .
July, 2009: A special court says that Maharashtra Control of Organised Crime Act (MCOCA) charges are not applicable and the accused be tried by a lower court in Nashik.
July, 2010: Bombay high court overturns the earlier court order and upholds the charges under provisions of MCOCA.
August 2010: Colonel Purohit and Sadhvi Pragya challenge Bombay High Court order for upholding the MCOCA charges.
April 2015: Supreme Court sends case back to lower court to consider the applicability MCOCA Act. Case transferred to National Investigative Agency (NIA).
February 2016: NIA tells court that the Attorney-General's opinion is being sought on whether the accused can be tried under MCOCA Act.
April 2016: MCOCA court gives clean chit to the 9 accused, saying there is no evidence against them.
April 2017: Sadhvi Pragya granted bail. NIA recommends charges against her are dropped.
August 2017: Colonel Purohit released from jail on conditional bail.
December 2017: A special court of the NIA discharges Sadhvi Pragya and Colonel Srikant Purohit.