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More than 1,200 girls have been affected in a series of recent poison gas attacks on schools in Iran. It is not yet known who committed this terrorist attack and why.

Xinzheng is a journalist.

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A female student is carried on a stretcher to an ambulance.

The front yard of the school is a mess.

[I'm choking! I can't breathe!]

Students scream and struggle in suffocating pain.

[Victim student: One student was nauseous and dizzy, and as time went on, more students ran outside complaining of similar symptoms.]

Poison gas attacks targeting girls in Iran have been ongoing since last November.

So far, more than 11,58 students in 1 schools have been affected.

Immediately after smelling the pungent smell emanating from inside the school building, the students experienced headaches, difficulty breathing, and in severe cases, paralysis.

Although the symptoms were temporary and not life-threatening, one student was hospitalized for several days.

The Iranian authorities belatedly began to assess the situation, setting up a fact-finding team led by the Ministry of the Interior.

It's been three months since the first damage was reported.

[Bahram Einolahi/Iranian Minister of Health: A special committee has been set up to investigate the facts, composed of toxicology experts and university professors.]

Despite the ensuing poison gas attacks, it is not yet known who targeted the girls and why.

There is speculation that it may be the work of Islamic fundamentalists who oppose women's education, or that it may be a retaliatory attack on the anti-government hijab protests that erupted last year.

While some parents and students are protesting against school, a video of plainclothes officers violently arresting protesting parents has sparked controversy.

(Video editing by Kim Byung-jik)