By Harmeet Shah Singh, Sumnima Udas
and Holly Yan
updated 6:46 AM EDT, Thu July 18, 2013
Bihar, India (CNN)
-- The headmistress of the Indian school where poisoned lunches killed 22 students is on the run.
Local police chief Sujit Kumar said authorities are looking for the principal, who was not named, and her husband for questioning.
The students started vomiting soon after their first bite of rice and potatoes Tuesday at the school in the northeastern state of Bihar. Some fainted.
On Thursday, 25 people remained hospitalized -- including 24 students and the school's cook, whose accounts of the incident are under scrutiny.