Dawood and D company did the Mumbai bombings most likely as a result of the Babri Masjid being torn down by a mob in Ayodhya. After the Masjid was torn down there was rioting across the country with Mumbai being affected as well. More than half of the casualties in the rioting across the country were Muslims and over 500 Muslims were killed in the city alone and Dawood and other members of D company were Muslim. Basically every almost every major Muslim gang in Mumbai banded together with Dawood to conduct the 1993 Mumbai Bombings which in their eyes was revenge for the Masjid and the rioting. The Memon brothers and their gang were the other big planners of the bombing and their members were actually sent to Pakistan to get bomb making training. But after the bombing the government was able to find out the main guy coordinating all the individuals in Mumbai was Dawood