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The headmistress of the Indian school that authorities say served toxic lunches, killing 23 students, was arrested Wednesday, police said, according to CNN.

Meena Kumari, 36, was taken into custody on her way to a court where she had gone to surrender herself, police Superintendent Sujeet Kumar told CNN. She will be questioned Wednesday and taken before the court Thursday, he said.

Authorities had been working to track down Kumari, who had been at large since the July 16 incident.

The whereabouts of her husband, who is not named as an accused person in the case, are still not known, Kumar added. Police want to question him in connection with the case.

Pesticides have been found in the food and oil used in the school lunch that sickened 25 others in northern India's Bihar state, police said.

Forensic scientists found monocrotophos, an organophosphorus compound used as an insecticide, "in the samples of oil from the container, food remains on the platter and mixture of rice with vegetables in an aluminum utensil," Assistant Director General Ravinder Kumar told reporters in Patna.

Monocrotophos, which is used for agricultural purposes, is toxic to humans.

Bihar's chief minister, Nitish Kumar, vowed that police would investigate the poisoning incident from all possible angles.