In the shaky mobile phone footage, women's voices can be heard panicking. The camera moves in and out of focus, positioned through a crack in a door frame. Across the yard, Pakistani police are outside a property, looking for undocumented foreigners. The officers flip through papers as several men sit expectantly inside. Then the video cuts out. Across Pakistan, unannounced arrivals of police are becoming increasingly common in a crackdown on hundreds of thousands of foreigners who do not have the right documents to stay. The vast majority affected are Afghans, who now face the threat of deportation. Many have reason to be fearful of returning to their country, after the Taliban seized power in 2021. They include journalists and human rights activists, members of the LGBT community, contractors who worked for US-led forces or the Afghan military, and women and girls who can no longer receive an education in their country. But the raid in the footage the BBC was sent by the family who filmed it, was targeting an area in Pakistan known for a particular ethnic group - the Hazara. Predominantly Shia Muslims, they have long been persecuted by Sunni extremists. Members of these two branches of Islam share many beliefs but differ on many other aspects of religion - and the sectarian divide has torn communities apart over the years. Out of fear of persecution in Afghanistan, many Hazaras decided to cross the border to Pakistan. "Life under the Taliban felt like a prison, they didn't see us as Muslim, they called us infidels. We never felt safe with them," Shakeba, a 17-year-old Hazara from Afghanistan, told the BBC. She arrived in Pakistan in early 2022. Shakeba has seen police raids on her neighbourhood but so far they haven't been to her house. She's terrified that she or her family will be picked up if they leave its four walls - they've been in hiding for the last three weeks. "Our faces look different. Even if we wear Pakistani clothes, we are easily identifiable. They identify us and shout 'Afghani, Afghani!'." Hazaras are of ethnically Mongolian and Central Asian descent; their features differentiate them from much of Pakistan and Afghanistan's populations. Like other Afghans in this article, Shakeba's name has been changed to protect her identity. Afghans make up almost all of the estimated 1.7 million foreigners that Pakistan says have no right to live in the country. Its move to expel undocumented foreigners came after tensions soared following a spike in cross-border attacks. Islamabad blames them on Afghanistan-based militants, a claim the Taliban government in Kabul denies. In the last two months, more than 400,000 people have crossed from Pakistan to Afghanistan. A highly uncertain future awaits them - some are staying in camps, others have set off across the country to start life again, often taking little with them as winter approaches.