Police suspect Bodo separatists of planting the powerful bomb which ripped the Brahmaputra Express train apart. Many of the estimated 1,200 people on board were burned or injured by the impact. No responsibility for the bomb was claimed by either of two militant groups active in the region - the Bodo guerrillas, or the United Liberation Front of Assam.
Violence against millions of landless immigrants who crossed the jungle borders from Bangladesh into India's north-east state has triggered unrest in the area for the past 25 years. By acting as vigilantes against illegal settlers, armed tribal separatists have caused frequent headaches in New Delhi. Yet, until this week, insurgency in the area was thought to be under control.
The blast came a day after tribal Bodo guerrillas blew up a road bridge that formed the main link between India's north-east regions and the rest of the country, injuring seven people.
Activists representing Bodo tribesmen living north of the Brahmaputra river want a homeland within India in the state of Assam. An extremist fringe, the Bodoland Army, has been fighting for a separate nation since 1989.
Most of the passengers were believed to be holiday-makers heading for Delhi to celebrate the new year. More than 5,000 people have been killed in Assam in ethnic and separatist violence in the last three years.Reuse content