By 1995 however, continuous migration led it to cross the 2,500,000 mark. During the administration of Prime MinisterBenazir Bhutto, some top advisers became concerned with the large Bangladeshi migrant population, afraid they could become second largest group in Karachi after Urdu-speaking Muhajir people and disturb sensitive demographics. Accordingly, Bhutto ordered a crackdown and deportation on Bangladeshi immigrants. Benazir Bhutto action strained and created tensions in Bangladesh–Pakistan relations, with Khaleda Zia, who was in power in Dhaka during the time, refusing to accept the deportees and reportedly sending two planeloads back towards Pakistan and Muslim political parties in Pakistan also criticised Bhutto and dubbing the crackdown as anti-Islamic. She was ultimately forced to abandon the order.
According to the community leaders and social scientists there are over 1.6 million Bengalis and up to 400,000 Rohingyas living in Karachi. There are numerous Bengali colonies in Karachi, often called "Mini Bangladesh", such as Machar Colony, Musa Colony and Chittagong Colony. The Bengali communities in Pakistan are also adopting Urdu and are assimilating with Muhajirs. When one walks through these colonies, one can see the colorful Bengali signboards, Bhashani caps, lungis and kurtas. The Chittagong Colony has a bazaar, which was famous throughout Pakistan as the center for Dhaka cloth. In more recent times, the Bengali population has seen a decline as the perilous journey from Bangladesh has been fraught with danger and tense borders. Furthermore given the tense ethnic rivalries and lack of social welcome in Pakistan Bengalis have now been travelling elsewhere.