The West Papua Liberation Army says it will meet Indonesian military and police on the battlefield.
The separatist group on Tuesday claimed responsiblity for the killings of at least 24 Indonesian construction workers in Papua.
In a statement on Wednesday, Liberation Army regional commander, Egianus Kogoya, reiterated claims the workers were soldiers disguised as civilians.
He said military and police should engage the group in a "gentlemanly" manner and not attack Papuan civilians.