Conversation so far:
What type of reports came from Anna Politkovskaya in Chechnya?
In numerous articles critical of the war in Chechnya and the pro-Russian regime there, Politkovskaya described alleged abuses committed by Russian military forces.
What were some of the abuses in Anna Politkovskaya's reports from Checnya?
Human rights abuses and policy failures elsewhere in the North Caucasus.
What were some of the human rights abuses chronicled by Anna Politkovskaya in Chechnya?
In one characteristic instance in 1999, she wrote about the plight of an ethnically-mixed old peoples' home under bombardment in Grozny.
What were some of the different ethnicities in Grozny during Anna Politkovskaya's 1999 reports?
How many of Anna Politkovskaya's reports came from Chechnya?
What other interesting facts are in this article about Anna Politkovskaya's reports from Chechnya?
As Politkovskaya reported, the order supposedly restored under the Kadyrovs became a regime of endemic torture, abduction, and murder.
What did Anna Politkovskaya find out about the alleged mass poisoning of Chechen schoolchildren?
Politkovskaya knew the school children were poisoned by a strong and unknown chemical substance which incapacitated them for many months.

Question: How many children were involved?
Self-contained rewrite: How many children were involved in the alleged mass poisoning of school children in Chechnya?