788
At the same time they worried about chemical weapons attacks , Brooks disclosed that a special operations force in the southwestern desert had found a number of bottles `` marked in strange ways .''
 desert: place; they: target; weapons: instrument
Given event type and trigger, please tell me the arguments of all the listed option. Output format is "name1: role1; name2: role2". 
Event type: attack 
  Option: victim, attacker, place, target, instrument 
Text: {0} 
Answer:
 desert: place; they: target; weapons: instrument