The Iran police had captured 110 people on suspicion of connection to suspected poisonings at girls schools that have hospitalised hundreds of students since November.
The increase of mass illnesses has spread through hundreds of Iranian schools over the past few months, with teachers and students reporting the presence of noxious gas and smells that have caused vomiting and nausea.
According to Saeed Montazeralmahdi, spokesman for Iran’s police command, he said the arrests were the result of an increase in police foot patrols around affected institutions. 
Schoolgirls have staged classroom protests rebuking the male clerics that run the country. Several teenage girls have been beaten to death by security forces, according to the United Nations and several rights groups.
In 1979,Montazeralmahdi didn’t give details about the people arrested or if the police had determined the chemicals used. But in his words ,“stink bombs” had been deployed in some cases and that a number of cases were the result of “psychological factors” rather than poisoning.
Arrests weren’t made until Supreme Leader Ayatollah Ali Khamenei spoke publicly to condemn the attacks for the first time last week.
