KABUL, Aug 15 (Reuters) - Afghanistan President Ashraf Ghani has left the capital Kabul for Tajikistan, a senior Afghan Interior Ministry official said on Sunday. Asked for comment, the president"s office said it "cannot say anything about Ashraf Ghani"s movement for security reasons". A representative of the Taliban, which entered the capital Kabul earlier on Sunday, said the group was checking on Ghani"s whereabouts.