At an Iranian girls' school, students are complaining of shortness of breath, paralysis and nausea.

Because of a toxic gas attack targeting a schoolgirl.

In front of a girls' school in Iran.

Dozens of students evacuated from the school cough and complain of pain.

A line of students is taken to the hospital, but when the ambulance is prevented from passing by the vehicle, the people join forces to push the car away.

The hospital was quickly filled with students.

In the past three months, more than 3 girls in more than 30 schools have been subjected to mysterious gas attacks.

[Student: I smelled gas in the classroom for the first time, and then one of my classmates said she was dizzy and sick. As time went on, more and more kids started running out of the classroom saying they were nauseous.]

Some students have been experiencing symptoms of addiction for months.

There are also voices calling for online classes in response to fears of indiscriminate terrorism.

The problem is that the subject of the attack and the type of gas have not yet been identified.

For one thing, Iranian authorities believe it is the work of a terrorist group aimed at shutting down girls' schools.

[Bahram Einolahi/Iranian Minister of Health: A special committee of toxicology experts and professors has been set up to investigate the recent attack on the poison gas of schoolgirls.]

Some foreign media believe that extremist conservatives are behind it.

In July last year, 400-year-old Mahsa Amini was arrested by police for not wearing the hijab properly.

Since then, anti-government protests have continued led by young women, in retaliation for extremist forces.

Iran is relatively well-educated in the Muslim world.

Since there has been no significant discrimination against women in education, there are growing concerns about the new movement to spread Islamic fundamentalism in Iran.