Children of chef are among the dead at Indian school Authorities think the poison was a chemical used in agriculture At least 23 died and 25 were hospitalized The deaths have prompted a focus on food safety (CNN) -- [Breaking news update, 8:55 a.m. Another mass food poisoning case has been reported in India. At least 23 students in the southwestern coastal state of Goa were treated at a hospital after they were sickened during lunch, police said. Earlier this week, 23 students died and 25 people were hospitalized from food poisoning during a school lunch in northern India's Bihar state. [Original story published at 8:19 a.m. Two children of the chef at the Indian school where pupils were poisoned at lunch were among those who died, CNN's sister network CNN-IBN reported. Lal Babu Rai, husband of the school cook, Manju Devi, told CNN-IBN reporter Prabhakar Kumar that three of their children got sick during the meal. Along with the two dead, the other remains in the hospital, he said. At least 23 students died and 25 are hospitalized after they were sickened while eating a lunch of rice and potatoes at the primary school in India's Bihar state on Tuesday. The incident -- which occurred in India's poorest state -- shines the light on food safety and has prompted discussion on how to improve school food programs amid news that authorities warned of safety problems with Bihar's school meal program months ago. The incident was a parent's worst nightmare in the poverty-stricken community. The students, who authorities said were between the ages of 5 and 12, started vomiting soon after their first bite of lunch. The parents of at least three children have buried their lost ones near the school -- one right in front of the building, according to CNN journalists who saw the burial mounds. One news video showed men apparently attacking a school bus with sticks. Others gathered together and held signs. Students at nearby schools refused to eat. A group that supplies lunches to schools in the Chhapra district of Patna was attacked. At present, it's unclear whether the children were intentionally or accidentally poisoned. An investigation into the tragedy is under way. Police told CNN that investigators have been unable to find the headmistress of the school in order to question her, and authorities were questioning the cook, also hospitalized in the tragedy. Shahi told the state has been working "to improve the quality and ... try to get good food served," he told CNN.