Pakistan’s government announced a major crackdown Tuesday on migrants in the country illegally, saying it would expel them starting next month and raising alarm among foreigners without documentation who include an estimated 1.7 million Afghans.

The country’s caretaker Interior Minister Sarfraz Bugti said the crackdown was not aimed at Afghans and would apply to all nationalities, though the vast majority of migrants in the country are Afghans.

The campaign comes amid strained relations between Pakistan and neighboring, Taliban-led Afghanistan over what the Pakistani government says are attacks in Pakistan by Taliban-allied militants who go back and forth across the countries’ shared 2,611-kilometer (1,622-mile) border and who find shelter in Afghanistan.