Another two victims of laptop battery explosion died in Burn Unit of the Allied Hospital-1 here on Thursday, rising the death toll to four. According to police, 9-year-old Talha s/o Ahmad and his sister Dua Fatima (6 years) had died on Wednesday while seven others including Farhat (45) w/o Aslam, her son Makki Raza (24), grandson Rehan Raza (8), granddaughter Eman Fatima (4), Nargas (32) w/o Muhammad Ahmad, her son Muhammad Ibrahim (3) and Rashida (40) wife of Ali Raza sustained serious injuries when a house caught fire due to burst of a laptop battery in Mohallah Sharifpura on Satiana Road. The Rescue-1122 had shifted the victims to Burn Unit of the Allied Hospital-I where 2 more victims- Nargas (32) and her son Muhammad Ibrahim (3) breathed their last today while the condition of 3 injured was stated to be critical. Police were investigating the incident.