Six months ago, pilot Hana Khan saw her picture on an app that appeared to be auctioning scores of Muslim women in India. The app was quickly taken down, no one was charged, and the issue shelved — until a similar app popped up on New Year's Day.

Khan was not on the new app called Bulli Bai — a slur for Muslim women — that was hawking activists, journalists, an actor, politicians and Nobel Laureate Malala Yousafzai as maids.

Amid growing outrage, the app was taken down and four suspects were arrested last week.