TIMELINE - Major attacks in India since 2005

(Reuters) - Eleven bomb blasts in quick succession ripped through the main city of India's troubled northeastern Assam state and three other towns on Thursday, killing 76 people and injuring at least 320.

No one has claimed responsibility for the blasts.

Following is a chronology of some of the major attacks in India in the past three years:

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 blasts in the Hindu pilgrimage city of Varanasi.

July 11, 2006 - More than 180 are killed in seven bomb explosions at railway stations and on trains in Mumbai that are blamed on Islamist militants.

Feb 19, 2007 - Two bombs explode aboard a train heading from India to Pakistan; at least 66 passengers, most of them Pakistanis, burn to death.

Aug 25, 2007 - Three coordinated explosions at an amusement park and a street stall in Hyderabad kill at least 40.

May 13, 2008 - Seven bombs rip through the crowded streets of the western city of Jaipur, killing at least 63 in markets and outside Hindu temples.