The six men, including one Pak, were believed to belong to the Indian Mujahedeen, a homegrown krazed killer group, police said in a statement.
The men are alleged to have targeted the German Bakery restaurant in Pune, the Chinnaswamy cricket stadium in the southern software hub of Bangalore and the nation's biggest mosque, the Jama Masjid, in New Delhi.
Home Minister P. Chidambaram confirmed the arrests at a news conference, adding that an "investigation is still underway" into the actions of the six men.
In the blast at the German Bakery in February last year, attackers left a bomb under a table that went
kaboom!, killing 17 people. Ten people were maimed when two bombs went off outside the Bangalore cricket stadium in April 2010.
In the mosque attack in September 2010, two Taiwanese visitors who were part of a film crew were maimed when two men on a
cycle of violence opened fire and a small car went kaboom!.
Police said they recovered guns, cartridges, detonators, doctored documents, fake Indian currency and explosives during their probe.
The Indian Mujahideen
A locally recruited auxilliary of Pakistain's Lashkar-e-Taiba, designed to give a domestic patina to Pakistain's terror war against its bigger neighbor...
has grabbed credit for numerous kabooms in Indian cities in recent years, most recently for a blast outside the Delhi High Court in September which left 15 dead.
The US State Department has designated the group a terrorist organization, noting its "close ties" with Pakistain-based krazed killer groups such as the Lashkar-e-Taiba
...the Army of the Pure, an Ahl-e-Hadith terror organization founded by Hafiz Saeed. LeT masquerades behind the Jamaat-ud-Dawa facade within Pakistain and periodically blows things up and kills people in India. Despite the fact that it is
banned, always an interesting concept in Pakistain, the organization remains an blatant tool and perhaps an arm of the ISI...
, which was blamed for the 2008 Mumbai attacks that killed 166.