The officials said that the Mangolpuri police station has registered a case and is probing the exact cause of the fire. The fire erupted at a shoe-making factory in Phase 1 of Mangolpuri Industrial Area in the wee hours of Saturday. Four people died, and two others were injured after a massive fire broke out at a shoe factory in Phase 1 of the Mangolpuri Industrial Area in Delhi at around 9:30.