In Gurugram, an upscale suburb just outside Delhi, gleaming SUVs, futuristic skyscrapers and neat apartments stand in stark contrast to nearby mosquito swarms, trash heaps and tarpaulin shanties.

Inside the gated compounds live some of India's richest, while in the slums nearby live poor migrant workers - mostly domestic helpers, garbage-pickers and daily-wage workers - who keep the affluence going.

Last month, local authorities rounded up hundreds of these workers, most of whom say they are Bengali-speaking Muslims from India's West Bengal state, in a "verification" drive targeting illegal Bangladeshi immigrants.

The suspects were detained and kept at "holding centres" where they were asked to provide documents to prove their citizenship. Many allege they were beaten and mistreated by police during the process. Police officials deny these allegations.

"I had my voter and national ID cards, but they told me they were fake. I spent six days not knowing my fate before I was finally released," said Ather Ali Sheikh, a daily-wage worker, who has lived in the city for 15 years.

The action has left indelible scars on the social fabric of the city, which prides itself on its cosmopolitan culture. Hundreds of workers have fled overnight - abandoning jobs, homes and, in some cases, even families in their haste to escape.

"I still don't understand why they suddenly came after me," Mr Sheikh said. Behind him, his wife hurriedly packed their belongings - torn clothes, old utensils and school books - into flimsy boxes.

"Was it because of my language, my religion or because I am poor? " Mr Sheikh continued, his face hardening with anger. "Why weren't the rich Bengali residents held up?"

Police in Gurugram deny targeting any particular community. "Neither religion nor class has anything to do with the drive," public relations officer Sandeep Kumar told the BBC.

He added that out of the 250 people picked up, only 10 have been identified as illegal migrants and will actually be deported.

"Everyone else was released.........

© BBC