Hyderabad's historic Mecca Masjid was targeted in a terror attack on May 8, 2007 during Friday prayers, killing nine people and wounding 58.
Eleven years later, a special NIA court in Hyderabad today acquitted five accused, including Swami Aseemanand, in the case.
Ten persons had been named as accused in the Mecca Masjid blast case but only five of them were arrested and sent up for trial.
Those who faced trial were Naba Kumar Sarkar alias Swami Aseemanand, Devendra Gupta, Lokesh Sharma, Bharat Mohan Lal Rateshwar alias Bharat Bhai and Rajendra Choudhary.
One of the accused, Sunil Joshi had died - murdered in Indore and the case is yet not decided. Two other accused in the case - Sandeep V Dange and Ramchandra Kalsangra (both members of the RSS) were never caught.
The NIA is still probing the case against remaining two accused - Tejram Parmar and Amit Chouhan, who are still absconding.
Mecca Masjid is one of the attractions of Hyderabad and cited as the perfect example of the composite culture of India in general and the Deccan in particular.
It is one of the few mosques in the country where both Shias and Sunnis assemble at one place to offer prayers. Hindus comprise the sizeable number among the tourists visiting the Mecca Masjid.
Over two hundred years ago, a Shia ruler of erstwhile Golconda kingdom - Sultan Mohammad Qutub Shah - began construction of the Mecca Masjid in 1616-17. The chief mason of the Mecca Masjid was Rangaiah Chowdhury, who put to effect the design prepared by chief engineer Faizullah Baig.
Chowdhury is credited to have personally supervised the construction of the Mecca Masjid and erect a structure as per the wish of the Qutub Shahi ruler. The construction of the Mecca Masjid went on for several decades.
The construction work was completed in 1694 during the rule of Mughal emperor Aurangzeb, the powerful Sunni ruler of the time.
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Watch: 2007 Mecca Masjid blast case: All accused acquitted due to lack of evidence