Prosecutor on talks with Denmark over Zakayev's extradition

The General Prosecutor's Office has prepared and submitted materials to the Danish Ministry of Justice regarding the charges and evidence of Zakayev's guilt in specific crimes. They have considered the requests of the Danish side to provide additional evidence and specific charges. Zakayev is accused of forming a gang between 1991 and 2000, with numbers ranging from 300 to 1,500 militants and bandits, committing both terrorist and general criminal offenses.

What was the range of the gang's membership over time?

What types of crimes were committed by the gang mentioned in the text?