Following is the chronology of major blasts in the country since 2008:
Delhi, Sept 7, 2011: 15 killed and 76 injured when a bomb went off outside the Delhi High Court.
Mumbai, July 13, 2011: 27 killed and over 140 injured in three serial blasts at Zaveri Bazaar, Opera House and Dadar Kabutarkhana in Mumbai.
Varanasi, Dec 7, 2010: Two-year-old girl killed and 25 others injured in a blast which takes place between the Dashashwamedh and Shitla ghats on the river Ganga.
Pune, Feb 13, 2010: 17 people killed and over 60 injured when a bomb rips through the famous German bakery in the city.
Mumbai, Nov 26, 2008: 166 people killed in coordinated serial explosions and indiscriminate firing across Mumbai including the crowded CST railway station and two five-star hotels -- Oberoi and Taj.
Assam, Oct 30, 2008: At least 77 killed and over 100 injured in 18 bombings across Assam.
Imphal, Oct 21, 2008: 17 killed in a powerful blast near Manipur Police Commando complex.
Malegaon, Maharashtra, Sep 29, 2008: Five people killed after a bomb kept in a motorbike goes off in a crowded market.
Modasa, Gujarat, Sep 29, 2008: One killed and several injured after a low-intensity bomb kept on a motorcycle goes off near a mosque.
New Delhi, Sep 27, 2008: Three people killed after a crude bomb is thrown in a busy market in Mehrauli.
New Delhi, Sep 13, 2008: 26 people killed in six blasts across the city.
Ahmedabad, July 26, 2008: 57 people killed after 20 synchronised blasts in less than two hours.