Union Home Minister Amit Shah must take responsibility for violence in Delhi and resign, Congress chief Sonia Gandhi said today, hitting out at the government over the large-scale violence that has erupted in parts of northeast Delhi, killing 20 people and over 180 injured. What was the Home Minister doing since last week? What was the Home Minister doing earlier this week? Why were the paramilitary forces not called in earlier when the Home Ministry saw the situation worsening, Mrs Gandhi said at a press conference at the Congress headquarters in the capital.