Qureshi (46) had been on the run since 20 blasts ripped through Gujarat's main city Ahmedabad on July 26, 2008, killing more than 50 people and wounding several others.
But he was finally nabbed by the Delhi Police's Special Cell on Saturday night, bringing to rest a manhunt of 10 long years.
Qureshi alias Tauqeer was the co-founder of the Indian Mujahideen (IM) and also headed the SIMI.
But luck ran out on him Saturday night when he was arrested for the first time by the Special Cell from east Delhi's Ghazipur area following a brief exchange of fire.
More From This Section
An officer privy to the probe said that Qureshi has a "cool personality" and is somebody who "does not get hyper".
"He could easily mingle with a crowd. In order to avoid being nabbed, he would always use pubic transport and would travel in general coaches in trains. If he had a meeting fixed at a particular hour, he would either reach there before the scheduled time or would reach late," the officer said.
"A look into his life belies the theory that terrorists come from uneducated and deprived backgrounds," said Pramod Singh Kushwah, Deputy Commissioner of Police (Special Cell).
He did his schooling from a Christian missionary school, in Byculla, Mumbai. In 1992, he got admission in the Bhartiya Vidyapeeth, Navi Mumbai and in 1995, he completed diploma in Industrial Electronics.
As a teenager, he started visiting the Muslim Charitable Library near his house where he would read many newspapers and took a keen interest in issues related to Islam. He also started taking part in social gatherings on religious issues, the DCP said.
He had sound technological knowledge, and even passed the Microsoft Certified Software Engineering (MCSC), besides doing Industrial Electronics from Bhartiya Vidyapeeth, Mumbai and hardware networking course.
During this period, he also attended weekly programmes of SIMI in Kurla, Mumbai and came in contact with Riyaz Bhatkal, then a student in Byculla College, Mumbai.
He joined SIMI in 1996. He got married in February 1999 and also switched his job location to Andheri East, Mumbai. By 2000, he had transformed into a highly-radicalised youth, totally disillusioned with the establishment and determined to follow the ideology of jihad, said the officer.
During his stay in Delhi, he grew very close to Safdar Nagori, the then General Secretary of Central Advisory Committee of SIMI.
After SIMI was banned in September 2001, some of its activists were arrested in Surat, Gujarat and Qureshi's name also figured during the investigation.
In order to evade Surat Police, he shifted his base to Bijapur, Karnataka. Nagori appointed him "Head Ansar" of Karnataka operations.
At that time Bhatkal was the nerve centre of radical youths and Qureshi who was by now second in command of SIMI, became a co-founder of Indian Mujahideen (IM) along with the Bhatkal brothers, the police officer said.
He efficiently worked as the main bridge between the old cadre of SIMI and the newly-founded IM. By 2005, after reviving SIMI in South India and forging proper ties with IM, he diverted his energies to carrying out action in Maharashtra and Gujarat.
SIMI and IM together wanted to carry out widespread terror activities. A meeting of SIMI cadres under the aegis of Nagori and Qureshi took place at Castle Rock, Hubli, Karnataka in 2007.
The duo organised training camps of SIMI cadres at Choral, (Indore, MP) in November 2007, at Wagamon (Kerala) in December 2007, at Halol (Gujarat) in January 2008.
In these camps, physical and psychological training was imparted to the cadres to wage jihad against India.
Qureshi has a gift of gab to influence and motivate impressionable minds into waging jihad, said the officer.
It is understood that he is a bomb-maker and the suspected signatory of the IM terror email as 'al-Arabi', he added.
After Nagori was arrested, he planned the Gujarat blasts to avenge the arrest of Nagori and other SIMI members and to send out a strong message to the establishment.
He is also the suspected handler of Alam Jeb Afridi who had planted the low-intensity bomb in Church Street, Bengaluru on December 28, 2014, a fact that the Delhi Police will confirm with their counterparts there, the officer said.
Qureshi had not visited hi Mumbai residence in the last 10 years and was in Nepal after executing the 2008 Gujarat blasts.
In Nepal, he worked as an English teacher while also arranging funds for revival of IM. It is suspected that he also had links with ISIS since many of his associates also had foreign linkages.
Maharashtra's Anti-Terrorism Squad (ATS) will coordinate with the Delhi Special Cell and send a team to interrogate Qureshi who is in custody of the Delhi Police, sources in the state police said in Mumbai.
The ATS will seek Qureshi's custody in connection with the pending cases against him, the sources said.
The National Investigation Agency (NIA), probing the 2010 Delhi blast case, had announced a reward of Rs 4 lakh on Qureshi who had been followed by teams of the Special Cell of Delhi Police and other intelligence agencies.