What had happened in the 1993 Mumbai Serial Blasts?

On 12 March 1993, a series of 12 explosions took place across Mumbai's crowded places like the Bombay Stock Exchange, Air India Building and Zaveri Bazaar, killing over 250. The blasts were coordinated by gangster Dawood Ibrahim, Tiger Memon and others. The blasts took place within two hours and 10 minutes, on the day infamously known as 'Black Friday'.