Slamming him for trying to provoke a clash between the provinces of Khyber Pakhtunkhwa (KP) and Punjab on the basis of ethnicity, former Pakistan Prime Minister Nawaz Sharif, head of political party Pakistan Muslim League – Nawaz (PML-N), has said that his arch political rival and former Premier Imran Khan is acting like “Central Asian invaders” who used to repeatedly attack the Punjab region in ancient times.