TIMELINE - Major attacks in India since 2003

(Reuters) - Scores of tourists are being held hostage in two of the Mumbai's top hotels officials said on Thursday, after at least 101 people were killed in a wave of armed attacks in the Indian financial capital.

Mumbai has been repeatedly hit by deadly militant attacks over the past 15 years, the worst of which targeted its suburban rail network and killed more than 180 people in July 2006.

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

March 13, 2003 - Bomb attack on a commuter train in Mumbai kills 11 people.

August 25, 2003 - Two car bombs kill about 60 in Mumbai.

August 15, 2004 - A bomb explodes in the northeastern state of Assam, killing 16 people, mostly schoolchildren, and wounding dozens.

October 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 northern 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 that are blamed on Islamist militants.