Two unidentified groups vandalised two factories in Birjung and set property worth millions of rupees on fire. An armed group overpowered guards and set fire to a storehouse belonging to Balaji Petrochem on Saturday night, and another group may have hurled what appears to be a petrol bomb at the premises of Jayswal Wood Industry. Balaji reported losses worth Rs 60 million and the Jayswal group said it lost Rs1.4 million in the fire.