MOSCOW, June 1 There are 20 defendants in the case of the terrorist attack in Crocus City Hall, 18 of them were arrested, two more were given a preventive measure in the form of a written undertaking not to leave the place, follows from the published text of the court ruling in relation to the four accused.
«20 persons were brought in as defendants, for 18 the court chose a preventive measure in the form of detention, for two a preventive measure was chosen in the form of a written undertaking not to leave the place and proper behavior,» says the resolution published in the court file . 
A terrorist attack in the Crocus City Hall concert hall in Krasnogorsk near Moscow occurred on March 22: the attackers opened fire with automatic weapons on the people in the building and set the auditorium on fire. 145 people died.
In this case, 12 defendants were arrested in Moscow, another five people were placed in a pre-trial detention center in Makhachkala.