A US court has issued summons to India's Congress party to answer charges of 'conspiring, aiding, abetting and carrying out organized attacks on Sikh population of India in November 1984'.

The Central Bureau of Investigation (CBI), on Tuesday termed as "unreliable" a key witness of the 1984 anti-Sikh riots in Delhi, who had testified against Congress leader Jagdish Tytler, while clarifying its stand and giving a clean chit to the former central minister.