Tajiks in Pakistan (Urdu: تاجک) have inhabited north western valleys which lay adjacent to Tajikistan since ancient time, though many are not counted as ethnic Tajik's due to census irregularities. Small numbers of Tajiks had travelled to what is now modern Pakistan as technocrats, bureaucrats, soldiers, traders, scientists, architects, teachers, theologians and Sufis during the Islamic Sultanates and Mughal Empire and settled permanently. There are many shrines dotted throughout Pakistan in honour of noted Tajik noblemen. Many Pakistanis claim Tajik ancestry. In recent years, many Tajiks from Tajikistan have also settled in Pakistan due to the economic conditions prevalent in their home country, many have settled in the northern city of Ishkuman. In 1979, with the invasion by the Soviet Union of Afghanistan, a large number of Tajik refugees came from Afghanistan and settled throughout Pakistan. Exact numbers are difficult to ascertain as many don't have official identity cards or are counted as being Chitrali or Gilgiti in official census figures. There also large number of Tajiks from Afghanistan that have settled in Pakistan permanently. Many Tajiks refugees from Tajikistan lived in Pakistan and some of them returned to Tajikistan. At least 7.3% of Afghans in Pakistan are ethnic Tajiks. Additionally, there is a sizeable community of Chinese Tajiks in Pakistan.