(Updates toll)

Oct. 31 (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 77 people and injuring more than 320.

No one has claimed responsibility for the blasts. For the main story please click on [nDEL411826].

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.

July 25 - Eight small bombs hit the IT city of Bangalore, killing one woman and wounding at least 15.

July 26 - At least 16 small bombs explode in Ahmedabad in the state of Gujarat, killing 45 and wounding 161. A little-known group called the "Indian Mujahideen" claims responsibility for the attack and the May 13 attack in Jaipur.

Sept 13 - At least five bombs explode in crowded markets and streets in the heart of New Delhi, killing at least 23 and injuring more than 100. The Indian Mujahideen again claim responsibility.

Oct 30 - 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 77 and wounding more than 320. (Compiled by Tony Tharakan; editing by Krittivas Mukherjee amd Sanjeev Miglani)

AlertNet news is provided by