1455
the israeli government said its forces were returning fire and that miller was shot in the back , suggesting he could have been hit by palestinian gunmen .
 forces: attacker; gunmen: attacker
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:
 forces: attacker; gunmen: attacker