However , the Muslim settlement was permanently established when the medieval Islamic invasion occurred in Chittagong .
Muslim traders and preachers from the then Islamic worlds had been settling in Chittagong due to the close proximity of Chandanaish from the river Karnaphuly .
The Islamic settlement was permanently established when the medieval Islamic invasion occurred in Chittagong .
Muslim traders and preachers from the then Islamic worlds had been settling in Chittagong due to the close proximity of Chandanaish from the river Karnaphuly .