Following is a chronology of some of the major attacks in India in the last five years:
March 13, 2003 - A bomb attack on a commuter train in Mumbai kills 11 people.
Aug. 25, 2003 - Two almost simultaneous car bombs kill about 60 in Mumbai.
Aug. 15, 2004 - Bomb explodes in northeastern state of Assam, killing 16 people, mostly schoolchildren, and wounding dozens.
Oct. 29, 2005 - Sixty-six people are killed when three blasts rip through markets in New Delhi.
March 7, 2006 - At least 15 people are killed and 60 wounded in three explosions in the north Indian Hindu pilgrimage city of Varanasi.
July 11, 2006 - More than 180 people are killed in seven bomb explosions at railway stations and on trains in Mumbai, blamed on Islamist militants.
Sept. 8, 2006 - At least 32 people are killed in a series of explosions, including one near a mosque, in Malegaon town, 260 km (160 miles) northeast of Mumbai.
Feb. 19, 2007 - Two bombs explode aboard a train bound from India to Pakistan, burning to death at least 66 passengers, most of them Pakistanis.
May 18, 2007 - A bomb explodes during Friday prayers at a historic mosque in the southern city of Hyderabad, killing 11 worshippers. Police later shoot dead five people in clashes with hundreds of enraged Muslims who protest against the attack.
Aug. 25, 2007 - Three explosions within minutes at an amusement park and a street-side food stall in Hyderabad kill at least 40 people.
May 13, 2008 - Seven bombs rip through the crowded streets of India's western city of Jaipur, killing at least 63 people in markets and outside Hindu temples.
July 25, 2008 - Seven blasts strike the IT city of Bangalore killing at least one person and injuring at least 15.