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Mr Modi told reporters he had been questioned for several hours by the Supreme Court-appointed panel, but gave no details of his testimony.
RK Raghavan, head of the panel, told reporters he was was "fully satisfied" with the questioning of Mr Modi.
He said Mr Modi could be called again for questioning "only if major gaps have remained in his answers".
Mr Raghavan said the panel would examine the evidence and hoped submit a report to the Supreme Court by 30 April.