NEW DELHI: India's home minister has accused key Hindu nationalist groups of promoting terrorism at their training camps, a charge strongly denied by hard-line groups.

Home Minister Sushilkumar Shinde says an investigation by government agencies has revealed involvement of Hindus in the bombing of a Pakistan-bound train that killed 68 passengers in 2007 and an explosion in a crowded market in western India's Malegaon town that killed seven people in 2008.

At a meeting of the ruling Congress party in the western Indian city of Jaipur on Sunday, Shinde accused main opposition Bharatiya Janata party and its parent organisation, the Rashtriya Swayamsevak Sangh, of blaming minority Muslims for these bombings.

Mukhtar Naqvi, a BJP spokesman, demanded an apology from Congress leader Sonia Gandhi for Shinde making such ''a baseless and provocative charge.''