Of the four acquitted is Swami Aseemanand, a former affiliate of far-right outfit Rashtriya Swayamsevak Sangh, the parent of India's ruling party. He had earlier confessed to bombing the train in which 68 people, mostly Pakistanis, were killed.
Rally called by far-right Hindu groups draws tens of thousands in northern Indian city of Ayodhya, as demands grow to build a Hindu temple on a site where a mosque was demolished in 1992, sparking deadly Hindu-Muslim violence.