Speculations There was speculation that the pattern of the blasts suggested involvement of
Indian Mujahideen (IM). According to the Delhi Police, Indian Mujaheddin has been conducting blasts on the 13 or 26 of the month. Speculation was also rife that the hard-line Taliban
Mumbai underworld could be behind these blasts, in the light of the killing of journalist
Jyotirmoy Dey, as well as the attempted assassination of
Dawood Ibrahim's brother, Iqbal Kaskar on 3 May 2011. The day 13 July is also observed as Kashmir Martyr's day, and there could be a possibility that the attacks were carried out by Kashmiri groups. There is also a view that the attacks could have been plotted by those trying to derail the
Indo-Pakistani peace process. The slain
MiD DAY crime journalist
Jyotirmoy Dey had previously reported that a huge cache of 35
detonators, gelatin sticks and large quantity of
ammonium nitrate explosives had been seized on 20 May 2011 from Umarkui and Sayli village in
Silvassa. Ammonium nitrate, gelatin and detonators have been used in several bomb blasts in Mumbai previously. The report also mentioned that this cache had gone missing soon after local police took custody. The journalist had also speculated that the cache might be used to trigger terror attacks in the city.
Timeline of investigations The
Home Ministry classified the bomb blasts as a terrorist act and dispatched a
National Investigation Agency (NIA) team to the bomb site. The
Chief Minister of Maharashtra Prithviraj Chavan said that the bombs used could have been fuel filled, much like
molotov cocktails. Preliminary investigations suggested the use of multiple
IED explosives in the blasts with
ammonium nitrate-based explosives mixed with fuel oil. The explosives indicate some level of sophistication. It is also believed that remote
detonators may have been used, with two of the three blasts being high-intensity. The Home Minister also announced that his office would be updating the people through the media every two hours. A
NIA team visited
Ahmedabad on 15 July 2011 to meet an Indian Mujahideen suspect who was arrested by the Crime Branch in connection with the
2008 Ahmedabad bombings. On 16 July, Maharashtra ATS Chief
Rakesh Maria said that, based on forensic opinion and visit to the various sites, the possibility of a suicide bomber was being ruled out. However, a sketch of a possible suspect based on CCTV footage from one of the blast sites was being prepared. He added that in light of the sensitive nature of the investigation, the entire detail of the probe could not be revealed at that particular stage. On 4 August, Home Minister
P. Chidambaram suggested indications of involvement of a home-grown terror module in the blasts. On 9 August, the Maharashtra ATS arrested one person it claimed had stolen a bike used in the
Zaveri Bazaar explosion. The bike had been stolen from one Amit Singh a few hours before the blasts.
CCTV footage showed one person with long hair riding a stolen red colour
Honda Activa, entering the crowded lane, taking two left turns, placing the scooter at the spot of the explosion and walking off. On 23 January 2012, the
Mumbai Police claimed that it had solved the Mumbai Blasts case with the arrests of two suspects – Naqi Ahmed Wasi Ahmed Sheikh (22) and Nadeem Akhtar Ashfaq Sheikh (23) – hailing from
Darbhanga district of
Bihar. The Mumbai Police's ATS claimed that the two had stolen two scooters used in the blasts according to a scheme whose logistics were managed by
Yasin Bhatkal, the mastermind of the blast. However, this televised announcement baffled the other intelligence agencies. It was later revealed that Naqi Ahmed was assisting the
Delhi Police and other central intelligence agencies in tracking down two other perpetrators of the blast. On 25 May 2012, Maharashtra
ATS filed a
chargesheet against Naqee Ahmed, Nadeem Shaikh, Kanwar Pathrija and Haroon Naik (all are under arrest). Additionally, the
chargesheet named six others including
Indian Mujahideen mastermind Yasin Bhatkal and
Riyaz Bhatkal, Waqas Ibrahim Sad, Danish alias Tarbez, Dubai based Muzaffar Kolah and Tehseen Akhtar as wanted accused on the run. On 4 February 2014, Maharashtra
ATS was handed over the custody of
Indian Mujahideen mastermind Yasin Bhatkal for probing the 2011 Mumbai Bombings Case. On 16 July 2014 Mumbai ATS arrested Abdul Mateen Fakki from
Goa’s
Dabolim Airport, while he arrived from
Dubai by flight. He is accused of financing the terrorist operation by passing money through
Hawala sources to Indian Mujahideen co-founder
Yasin Bhatkal.
Allegations of police brutality The
Mumbai Police detained several men for questioning. One of those detained—Faiz Usmani—died while in police custody on 17 July, sparking allegations of
police brutality. Usmani was the brother of one of the accused in the
2008 Ahmedabad bombings case. It was alleged by his family members that Faiz Usmani was healthy when the police picked him up and that he was subjected to
torture in police custody. The police dismissed these charges and countered that Usmani was suffering from
hypertension and complained of giddiness after walking himself into a police station. He was admitted to the
Lokmanya Tilak hospital,
Sion, Mumbai, following which he died quickly due to blood
clots in brain and a heart attack. A
CID probe was ordered into Usmani's death. ==Aftermath==