India on Thursday displayed its military might at a parade marking the republic's founding 39 years ago, and Sikh militants in Punjab killed at least three people and tried to blow up a passenger train.

Security was tight in New Delhi for the Republic Day anniversary, reflecting fears that Sikh extremists would try to disrupt the celebrations. Sikh militants are campaigning for an independent homeland in Punjab, saying they are discriminated against by the country's Hindu majority.The 1.1 million-man Indian army displayed a new bridge-laying tank and marine helicopter in the capital amid a host of festive floats, camel-mounted riflemen and high-stepping military bands.