After arriving at the CBI office in the afternoon, Kumar told reporters that he had full faith in the country's institutions. "I am sure I will be fully proved innocent," he said.
The CBI summoned Kumar after his name figured in the case registered by the CBI though he is not named an accused.
In 2007, a bomb blast inside Mecca Masjid claimed nine lives. Five more people died in police firing following the blast.
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