870
The spate of bombings underscored how difficult it will be to carry out the U . S .- backed `` road map '' plan , a three - stage prescription for ending violence immediately and setting up a Palestinian state by 2005 .
 None
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:
 None