India appeared to retreat from its charge that Pakistan's spy agency planned Mumbai train bombings in July, with its national security adviser saying Sunday that investigators don't have strong evidence. "I would be hesitant to say that we have clinching evidence. We have pretty good evidence," M.K. Narayanan told the CNN-IBN television news channel. Narayanan's statement came as India and Pakistan prepared to resume official-level talks next month which India put on hold after the train bombings that killed more than 200 people. India's new foreign secretary, Shivshankar Menon, said earlier this month that India will give Islamabad evidence that Pakistan's spy agency planned the bombings.